Jovic vs Frech Set 1 Winner: Was 4-4 a Coin Flip on Kalshi?

The Quick Answer

Rain stopped Iva Jovic vs Magdalena Frech on the US Open Grandstand on Tuesday night with the first set level at 4-4, and Kalshi's Set 1 Winner market spent the night unable to agree on a price. By Wednesday morning the Jovic contract had last traded at 68¢, a clear favorite. The resting book said something much closer to a coin flip. The set arithmetic below lands between them, in the high 50s to low 60s for Jovic, and says both overnight answers were wrong.

The set resumed on Wednesday, Sept. 2, and this market has settled since. What follows is the pre-resumption board, frozen at 8:07 a.m. ET that morning, and the case for what a frozen set was actually worth.

How The Set Froze At 4-4

Yahoo Sports reported the sequence: with Jovic a game up and Frech serving, Jovic slipped on the Grandstand court in light drizzle and could not chase the ball, Frech won the point, and the game leveled the set at 4-4. Jovic went to chair umpire Aurelie Tourte and said, "You saw me. I literally, I didn't even run for the ball," then asked, "But I can stop?" Tourte's answer was the rule: "You cannot stop during the rally. I can check before we start the point. But once we start the point, we cannot replay." Play was suspended soon after as heavy rain crossed the outer courts.

The WTA's official score page showed the match suspended with Jovic having won 28 of the 55 points played. One point separated them on the scoreboard. The market separated them by nearly 40 cents.

The Board Kalshi Left Open Overnight

The full market as of 8:07 a.m. ET on Wednesday, Sept. 2, 2026, before play resumed:

Contract	Bid	Ask	Last trade	Contracts (24h)	Open interest
Jovic Wins Set 1	36¢	69¢	68¢	148,693	127,586
Frech Wins Set 1	21¢	44¢	29¢	85,106	67,495

The Jovic row said two things at once. The last trade and the ask agreed with each other, and they agreed with the Frech side's last print, close enough to a dollar combined to be reading the same set. The bid sat all the way down at 36¢, on an overnight book almost nobody was quoting before the courts opened. Read the midpoints instead and the favorite shrank to 52.5¢. Buying both asks cost $1.13 to collect a dollar, and that premium was the real price of touching this book before the players walked out.

The price history behind the board was noisier still. The hour the set was in play traded 118,190 Jovic contracts and printed as low as 17¢. The 68¢ headline that survived to morning came from a single seven-contract fill. A book like that is only the impatient talking to each other, which is why the midpoint, and never the last trade, was the read.

One clause mattered more than usual on a wet court: because the match was suspended, a retirement before the set ended would not have paid a dollar or zero, and Kalshi would have set a Fair Market Price at its discretion. Every number on this page assumes the set was finished.

Was 4-4 A Coin Flip?

Frech served the game that leveled the set, so Jovic served next and would have served first in a tiebreak. None of that order was worth anything on its own. Give both women the same chance of winning a point on serve and a set from 4-4 comes out at exactly 50 percent, tiebreak included. The only thing that moves the number is a real gap in how often each player holds, so the question was how big a gap the 68¢ print assumed.

The résumés supplied a gap. Jovic is the No. 14 seed, an 18-year-old from Torrance, California, at a career-high ranking who reached the Australian Open quarterfinals in January. Her 2026 Grand Slam record coming in was 9-3, with losses only to Sabalenka, Osaka and Pegula.

Frech, ranked No. 41 as of Aug. 31, is a former top-25 player with one WTA title. She was 2-3 in Grand Slam matches this year, and the two had never played.

So I ran the set from 4-4 under a few illustrative serve splits, using standard game and tiebreak scoring with Jovic serving first. These are assumptions, not measured rates for this match; they show how much asymmetry each price requires.

Points won on serve (Jovic / Frech, assumed)	Jovic holds	Frech holds	Jovic wins set 1 from 4-4
60% / 60%	74%	74%	50%
62% / 58%	78%	69%	59%
64% / 58%	81%	69%	64%
65% / 56%	83%	65%	70%

To justify the 68¢ price you need the bottom row, a hold gap you would expect between a top-15 player and a qualifier rather than between two women who had just split a set's points almost evenly. A gap the size of their rankings and records, the second or third row, lands in the high 50s to low 60s. That is above the midpoint and below the last print. Both overnight answers missed, and the truth sat between them.

The Birrell vs Marcinko tiebreak that rain froze on Sunday stopped at 3-3 with as few as four points left, and the crowd priced it at 50 because that is too little tennis for a ranking gap to show. This set had at least two full games left, enough for a hold gap to matter, which is why the arithmetic landed above even instead of on it. A short-fuse market is only as sharp as the sample it has left to price.

Before You Trade The Next Frozen Set

New York's attorney general sued Kalshi on July 31 claiming it is an illegal gambling operation, and that fight is pending. We track where prediction markets stand legally; check your state before you trade.

If pricing two games of somebody else's suspended set isn't your edge, OddsShopper's free expert picks cover full matches with full information. Our US Open betting picks cover the tournament the conventional way, and our comparison of US Open odds across Kalshi, Polymarket and the sportsbooks maps the wider board this contract sat on.

The Bottom Line

The overnight book offered a two-to-one favorite and a coin flip on the same set, and the arithmetic supported neither. When a suspended market reopens with a spread that wide, quote the midpoint and let the ask come to you. This market has settled; the board above is what it looked like before anyone knew.

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