The Prediction Markets

Market comparison

Day vs Zhang

2 venues · 18 outcome rows · 1 comparable lines · event identity linked · 0 verified parity · active

Polymarket

Open venue ↗

17 outcomes · $5K reported volume

Observed 2m ago

Recorded venue end date: Oct 31, 2026

Kalshi

Open venue ↗

2 outcomes · $3K reported volume

Observed 4m ago

Recorded venue end date: Nov 7, 2026

Check settlement rules before comparing contracts. Matched outcomes may settle differently. These venues also report end dates more than 48 hours apart; event identity does not mean the contracts close or settle together. These are stored prices; record update times do not certify live quotes. Differences exclude fees and available size.

Known rule differences between venues

  • Postponement: Kalshi resolves to a fair price if the game does not start within 48 hours of the scheduled time (tennis: not finished within two weeks); Polymarket stays open until the game is played and resolves 50-50 only if it is cancelled with no make-up (UFC/tennis: ~14 days).
  • Ties and draws in two-way sports (NFL, college football, UFC no-contest): both venues pay 50/50.
  • Soccer: both settle on 90 minutes plus stoppage time; extra time and penalties excluded.
  • Tennis: Kalshi requires a ball to be played and pays the winner; Polymarket pays the player who advances, including on retirement. A pre-match walkover is a fair price on Kalshi, 50-50 on Polymarket.
  • UFC: Kalshi ignores result changes after expiry; Polymarket follows the official UFC result.
  • Polymarket two-way moneylines are one contract priced on the first-named side; the other side is its complement (recorded as a derived relation, not a link).

A shared identity alone does not make a price difference executable.

Day

Partial parity

Payoffs match in ordinary outcomes; see the rule differences above.

Polymarket

47.5%

Bid 47.0% · Ask 48.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang

Open Polymarket ↗

Kalshi

48.0%

Bid 47.0% · Ask 48.0%

Kayla Day

Open Kalshi ↗

Price difference 0.5 pp

Completed Match

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

50.0%

Bid — · Ask 100.0%

Completed Match

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

64.5%

Bid 53.0% · Ask 76.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Set 1 O/U 8.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

50.5%

Bid 49.0% · Ask 52.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

50.0%

Bid — · Ask 100.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Set 2 O/U 8.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

50.0%

Bid — · Ask 100.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Set 2 O/U 10.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

50.0%

Bid — · Ask 100.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Set 2 O/U 9.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

49.0%

Bid 47.0% · Ask 51.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Set 2 Winner

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

49.0%

Bid 47.0% · Ask 51.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Set 1 O/U 9.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

47.5%

Bid 43.0% · Ask 52.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Game Spread +/-0.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

47.0%

Bid 44.0% · Ask 50.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Set 1 Winner

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

43.5%

Bid 42.0% · Ask 45.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 22.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

37.5%

Bid 36.0% · Ask 39.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Total Sets: O/U 2.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

33.5%

Bid 20.0% · Ask 47.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Set 1 O/U 10.5

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

33.5%

Bid 32.0% · Ask 35.0%

Set Handicap: Shuai Zhang (-1.5) vs Kayla Day (+1.5)

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

29.5%

Bid 28.0% · Ask 31.0%

Set Handicap: Kayla Day (-1.5) vs Shuai Zhang (+1.5)

Open Polymarket ↗

Kalshi

—

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 21.5

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

24.0%

Bid 1.0% · Ask 47.0%

Pan Pacific Open, Qualification: Kayla Day vs Shuai Zhang Match O/U 23.5

Open Polymarket ↗

Kalshi

—

Shuai Zhang

Not aligned

No persisted outcome identity connects these venue contracts.

Polymarket

—

Kalshi

53.0%

Bid 52.0% · Ask 53.0%

Shuai Zhang

Open Kalshi ↗

Prices are shown as percentages of a $1 payout. “pp” means percentage points. A dash means data is unavailable.

View event details, charts and rules →Explore more markets