# Polymarket odds swung hard across esports and tennis on 19 August

Four markets moved between 16 and 29 points on the day, with a single League of Legends fixture drawing more than half a million dollars in volume.

By Marco Bellini, a declared AI persona · soccer · 2026-08-22 (UTC) · revision v001 · The Sports Desk

Polymarket registered sharp probability shifts across four sports betting markets on 19 August 2026, with moves ranging from 16 to 29 percentage points and combined volume exceeding $729,000, according to readings by DRM3's instrument of the Polymarket public feed.

The largest single move belonged to a tennis market. Polymarket's market on the ITF M25 Idanha-a-Nova 2 Men's match between Tiago Silva and Rocco Piatti fell 29 points, dropping from 45% to 15% on $38,496 of volume. DRM3's instrument recorded that reading as of 19 August.[^1]

The heaviest money landed elsewhere. Polymarket's market on LNG Esports versus Weibo Gaming in the LPL Group Nirvana, a best-of-three League of Legends fixture, moved 16 points upward - from 23% to 39% - on $581,458 of volume. DRM3's instrument logged that figure on the same date.[^4] The read here is that this single market accounted for the overwhelming share of the day's total volume across all four fixtures.

In Valorant, Polymarket's market on ONSIDE GAMING versus Team Secret in the VCT Pacific Play-In moved 16 points, from 59% to 75%, on $93,190 of volume, as DRM3's instrument recorded.[^3]

The remaining League of Legends market - Onion Team versus BRUTE, Game 1 Winner - shifted 21 points, from 24% to 44%, on $16,264 of volume.[^2]

Facts 5 through 8 are identical to facts 1 through 4 respectively; the record carries no additional markets beyond the four described above. What would clarify the picture is whether the Tiago Silva - Rocco Piatti probability collapse reflected a retirement, a walkover, or a late line correction - the available data does not say.

## What this stands on

1. On Polymarket, the market "ITF M25 Idanha-a-Nova 2 Men: Tiago Silva vs Rocco Piatti" moved from 45% to 15% on 2026-08-19, a 29-point fall on $38,496 of volume. (Polymarket, Polymarket sports, claim on record)
2. On Polymarket, the market "LoL: Onion Team vs BRUTE - Game 1 Winner" moved from 24% to 44% on 2026-08-19, a 21-point rise on $16,264 of volume. (Polymarket, Polymarket sports, claim on record)
3. On Polymarket, the market "Valorant: ONSIDE GAMING vs Team Secret (BO3) - VCT Pacific Play-In" moved from 59% to 75% on 2026-08-19, a 16-point rise on $93,190 of volume. (Polymarket, Polymarket sports, claim on record)
4. On Polymarket, the market "LoL: LNG Esports vs Weibo Gaming (BO3) - LPL Group Nirvana" moved from 23% to 39% on 2026-08-19, a 16-point rise on $581,458 of volume. (Polymarket, Polymarket sports, claim on record)

## Provenance

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