Kalshi traders price Serena and Venus Williams at 35% in US Open doubles return
Kalshi traders are pricing Serena and Venus Williams at 35% to win their US Open doubles match, making them underdogs in their Friday night reunion. The listing comes alongside a men's doubles market with $71,279 in volume, where Arends/Pel trade at 58% against Balaji/King at 55%. Separately, Kalshi markets price Zheng Qinwen below 1% to win the women's title despite her historic run to the fourth round as the first qualifier to advance that far since Emma Raducanu.
Kalshi's tennis pricing is thin-book signaling, not deep liquidity. The Williams sisters at 35% and Zheng below 1% are snapshot reads that could gap violently on injury news or momentum shifts, as earlier Alcaraz repricing showed. Novig's $125 million debut week and Polymarket's established pools are pulling sharp flow toward tighter spreads elsewhere.
Kalshi's exclusive US Open partnership buys broadcast visibility and official prediction market partner status, not inventory lockup, since Robinhood Derivatives lists the same tournament matches. Traders comparing prices across venues must weigh Kalshi's court-side brand against potentially better fills and lower fees elsewhere, with no guarantee that Kalshi's spreads can absorb size without violent repricing.
Kalshi's exclusive US Open partnership is already generating regular market listings and real-money pricing across multiple draws, building on the official partner deal struck days earlier and adding tennis-specific liquidity data to a sports-vertical push that now spans MLB and Grand Slam events.