WTA Elo Movers: Who Actually Rose and Fell Most Over 16 Days

Elo ratings aren’t static — they move every time the underlying model retrains on new results, and most of the time nobody’s watching that movement day to day. This article is a direct before-and-after comparison of our own dated Elo history: the WTA overall top 20 as it stood on September 5, 2026 against the same list on September 21, 2026, a 16-day stretch. It isn’t a forecast and it isn’t a power ranking. It’s just what changed, by how much, for which players, with the dates attached.

We’re covering WTA only in this article. Our Elo leaderboard and dated history track both tours, but this comparison sticks to the tour where we can show every player’s own rating page alongside their number — more useful for checking our work than a mixed list would be.

Why 16 days, and not a rounder number

Our site already has a dedicated Elo Movers page, and it applies a deliberate rule: it won’t call anything a “monthly” mover until the gap between snapshots is at least 21 days, specifically so a short run of matches doesn’t get mislabeled as a full month of form. Our dated snapshot history currently starts on September 5, 2026, which is only 16 days before the newest one — short of that 21-day bar, which is why you won’t see a “mover of the month” list from that tool yet.

We’re not going to round a 16-day gap up to a month, or wait for more days to accumulate before writing anything. Instead, this article does the same comparison the Movers tool eventually will, honestly labeled: exactly 16 days, September 5 to September 21, 2026, using our overall Elo top 20 for the WTA on both dates.

How we’re defining a “mover”

A player counts here only if she appeared in the WTA overall Elo top 20 on both dates. For each of those players, the “change” is simply her rating on September 21 minus her rating on September 5 — no smoothing, no estimation. Players who entered or left the top 20 during that window don’t have a valid before-and-after number (there’s nothing to compare on the missing side), so we list them separately rather than force a comparison the data doesn’t support.

The full comparison, ranked by movement

Fifteen players were in the WTA overall Elo top 20 on both September 5 and September 21, 2026. Here’s every one of them, ranked from the biggest riser to the biggest faller:

Player	Sept 5 Elo	Sept 21 Elo	Change
Sorana Cirstea	1819	1919	+100
Victoria Mboko	1822	1872	+50
Madison Keys	1811	1844	+33
Belinda Bencic	1818	1811	-7
Cori Gauff	1936	1927	-9
Mirra Andreeva	1850	1835	-15
Aryna Sabalenka	1939	1923	-16
Elena Rybakina	1924	1904	-20
Linda Noskova	1867	1825	-42
Karolina Muchova	1873	1828	-45
Marta Kostyuk	1909	1852	-57
Elina Svitolina	1893	1829	-64
Naomi Osaka	1842	1770	-72
Iga Swiatek	1929	1856	-73
Jessica Pegula	1946	1842	-104

Two things stand out immediately: only three of the fifteen actually rose, and the biggest single move in either direction (Pegula, -104) is roughly double the size of the biggest rise (Cirstea, +100).

Sorana Cirstea: the clearest riser

Sorana Cirstea posted the largest gain of anyone in the top 20, climbing from 1819 to 1919 — enough to put her at rank 3 in our current WTA overall standings, per her player page. Her surface splits explain some of that: a clay rating of 1939, above her overall figure, and a grass rating of 1922, both stronger than her hard-court number (1845, built on 21 tracked matches). Her player page’s match log — the last 10 logged results we have for her — shows an unbroken run of wins, which is at least consistent with a rating that’s been moving in one direction rather than bouncing around.

Victoria Mboko and Madison Keys: smaller but real climbs

Victoria Mboko is the second-largest riser, up 50 points to 1872 (tour rank 5). Her rating sits on a smaller matches-tracked total (21) than most of the names on this list, a reminder that her number, while real, is built on a thinner sample than Cirstea’s or Pegula’s.

Madison Keys rose a more modest 33 points to 1844 (tour rank 8). Her surface split is the most lopsided of the three risers: a grass rating of 1852 well clear of her hard-court number (1736) and clay number (1695), which suggests her overall gain is not evenly distributed across surfaces the way Cirstea’s is.

Jessica Pegula: the largest drop in either direction

Jessica Pegula fell furthest of anyone in the top 20, from 1946 to 1842 — a 104-point drop that still leaves her at tour rank 9, comfortably inside the top 10 on her player page, which is worth sitting with: a rating can move sharply without a player falling out of form entirely. Her surface numbers show hard courts (1851) as clearly her strongest surface right now, with clay (1648) and grass (1701) both well behind — a wide surface spread, similar in shape to several other names on this list.

Iga Swiatek and Naomi Osaka: two more double-digit declines

Iga Swiatek dropped 73 points to 1856 (tour rank 6). Her hard-court rating (1863) is actually her highest surface number right now, ahead of her own overall figure — a genuinely unusual shape, since for most players in this list the overall rating sits above every individual surface number. Her clay rating (1584) is a sharp outlier against her hard-court number, on a comparatively small clay sample (4 tracked matches).

Naomi Osaka fell 72 points to 1770 (tour rank 16), the steepest decline outside the very top of the rankings. All three of her surface ratings — hard (1647), clay (1602), grass (1556) — sit below her overall number, and her matches-tracked total (20) is among the smaller samples in this list, worth keeping in mind before treating her exact number as precise.

The rest of the fallers: a genuine cluster, not one outlier

Elina Svitolina (-64), Marta Kostyuk (-57), Karolina Muchova (-45), and Linda Noskova (-42) all lost between 42 and 64 points over the same window — a real cluster, not a single anomaly dragging the average down. We’ve written before about how Marta Kostyuk’s ratings differ across surfaces; her clay number (1860) remains her strongest surface even after this overall decline, well ahead of her hard-court figure (1714, on the largest surface sample of anyone discussed here — 46 tracked matches).

At the smaller end of the decline column, Aryna Sabalenka (-16), Elena Rybakina (-20), Mirra Andreeva (-15), and Cori Gauff (-9) moved only modestly — Gauff’s -9 is close enough to flat that it shouldn’t be read as a meaningful decline at all. Belinda Bencic (-7) is the smallest move of any player in the comparison, in either direction.

Who’s new to the top 20, and who dropped out

Five players entered the WTA overall Elo top 20 between September 5 and September 21 who weren’t there before: Iva Jovic (1789, tour rank 15), Emma Raducanu (1765, tour rank 17), Caty McNally (1762, tour rank 18), Alina Korneeva (1753, tour rank 19), and Shuai Zhang (1751, tour rank 20). None of them had a top-20 rating on September 5, so there’s no valid before-and-after number for any of them — only where they stand now.

Five different players dropped out of the top 20 over the same stretch: Diana Shnaider, Alexandra Eala, Amanda Anisimova, Marie Bouzkova, and Sara Bejlek. A top-20 list has a fixed number of seats — every new arrival forces someone else out, even if that player’s own rating barely moved.

Turning any of these gaps into a probability

None of the numbers above tell you who wins a specific match — they’re ratings, not forecasts. What they do let you do is convert a gap between two players into an estimated win probability: our Elo probability calculator takes any two ratings and does that conversion directly, rather than asking you to eyeball it. A 100-point gap (roughly the size of Cirstea’s total climb) implies a modest-to-clear favorite; the 104-point gap between Pegula’s old and new ratings is a similar order of magnitude, just moving in the other direction.

What this comparison doesn’t show you

This is a ratings comparison, not match-by-match analysis. We aren’t naming which tournaments or specific matches drove any of these changes, because our data files don’t give us a verified draw or schedule to cite — only the rating before and the rating after. A large move can come from a short run of results concentrated in a small number of matches, which is part of why some of the samples behind these numbers are still thin: Muchova’s overall rating, for instance, is built on only 16 tracked matches total, fewer than half of Kostyuk’s 86.

It’s also worth repeating what our surface-Elo explainer covers in more depth: a single overall number blends every surface a player has competed on. Several players here — Swiatek and Pegula in particular — show a wide gap between their strongest and weakest surface, which this overall comparison doesn’t capture on its own.

Where to check the live numbers

Every rating in this article is dated to September 5 or September 21, 2026. Because the model retrains on a rolling basis, the live numbers will already have moved by the time you’re reading this — check the full Elo leaderboard for the current WTA and ATP top 20 across all three surfaces, or the Elo Movers page once enough dated history has accumulated for it to publish its own monthly comparison. Nothing here is a prediction for any specific upcoming match, or a promise about what happens next.