Player props are eating the US sportsbook menu, and operators are reshaping around it

The headline number from Kambi's 2026 Trends Report landed quietly enough. Player props now account for around 41 percent of gross gaming revenue on the largest US sportsbooks, up from a single-digit share at the start of the legalised-sports-betting era in 2018. Same-game parlays sit at another 35 to 40 percent of GGR, with hold rates between 12 and 20 percent compared with the 4 to 6 percent books pull on a straight moneyline. Read the two figures together, and the picture is unambiguous. The product mix that defines a 2026 sportsbook is no longer the spread, the total, and the moneyline. It is whatever you can build out of an individual athlete's stat line.

That has changed how operators look. Menus on FanDuel and DraftKings now run past 60 distinct prop categories per league, with NFL passing yards and NBA points sitting next to MLB pitcher strikeouts, NHL shots on goal, soccer corners, and tennis aces. The plumbing has changed too. Sportradar's OC Player Props API v2, Stats Perform's Opta engine, Genius Sports' BetVision feed, and Huddle's deep-stack workflows now move data into trading rooms faster than the books can build new markets around it. And on the regulator side, Colorado, New Jersey, and the UK have each pushed visible prop-targeted policy through the early months of the year. The story is everywhere at once.

For readers new to this corner of the menu, the basics are still worth a quick refresher. The shurzy explainer on what is a player prop bet walks through the difference between a single-line prop, a same-game parlay leg, and a live micro-bet, and is a useful starting point before going any deeper into the operator and regulator side. The sections below pick up from there and walk through the 2026 picture as it actually sits.

The 41 percent number, and what it actually changed

The 41 percent figure is a Kambi number, drawn from the operators it powers and from peer disclosures across the major US books. It is the share of gross gaming revenue that comes from player-prop and same-game-parlay activity combined. In 2018, that share was effectively zero outside Nevada. By 2022 it was running in the low twenties. The 2026 number reflects three things at once. Better margin per ticket on parlay-style activity. Faster settlement on in-play and micro-bet markets. And a much wider menu of prop types that simply did not exist on US sportsbook screens five years ago.

Inside the 2026 prop menu

A modern US sportsbook in 2026 carries something like 60 distinct prop categories per top league, scaling up to a couple hundred individual lines on a busy NFL Sunday. NFL passing yards, rushing attempts, receiving touchdowns, longest reception, and quarterback rushing yards each have their own pre-game and live versions. NBA Player A points plus rebounds plus assists is now a default single-line prop on every major book. MLB pitcher strikeouts and total bases for batters drove the bulk of opening-day handle, and NHL shots on goal markets are being expanded after the Premium Plus data deal Sportradar locked in with the league last autumn. Tennis and soccer props sit on top of all of that for international readers.

The data spine: Sportradar, Genius Sports, Stats Perform, Huddle

None of this works without the data layer. Sportradar's OC Player Props API v2 powers more than 600,000 fixtures across 40-plus sports each year and now runs the bulk of the live-prop trading inside FanDuel, DraftKings, BetMGM, and several Latin American partners. Genius Sports supports 400-plus leagues, with BetVision and the Second Spectrum acquisition feeding computer-vision-derived markets that did not exist before 2024. Stats Perform's Opta engine carries roughly 7.2 petabytes of structured sport data and feeds the European trading rooms that lean less heavily on Sportradar. Huddle, the smaller and newer entrant, has built a loyal book of mid-tier operators with niche-sport coverage. The four together are the rails the prop economy now runs on.

The Colorado, New Jersey, and UK regulators wave

Regulators have started to engage with the prop boom in earnest. Yogonet's coverage of the Colorado proposals walks through a set of Colorado proposals introduced in March that would restrict certain college player-prop categories outright, alongside new affordability and at-risk-player triggers. New Jersey's Division of Gaming Enforcement opened a public-comment window through November on an at-risk-player package, and the UK rollout for 2026 layered a 40 percent Remote Gaming Duty and frictionless affordability checks on top of operator licensing requirements. Read together, the three represent the first coordinated policy push on player props since the 2018 PASPA repeal.

Micro-betting and in-play props are doing the heavy lifting

Micro-betting, where wagers settle on the next play or the next possession in seconds rather than minutes, is the format moving fastest. Betr raised more than 30 million dollars to push a DFS-flavoured micro-bet app, You Call The Play patented a live mobile micro-betting flow, and Simplebet's product, now folded into DraftKings after the 2023 acquisition, is now embedded inside the bigger book's in-play funnel. Live props more broadly account for around 55 percent of US online sportsbook handle in 2026, according to Kambi's read, up from sub-30 percent in 2022. The combination of low-latency data, mobile-native UX, and tight settlement loops is what is doing the work here.

What ESPN's opening-day data signalled to the books

Sportsbook trading rooms read mainstream sports media closely on big preview days. ESPN's 2026 opening-day MLB preview landed in late March with team-by-team rankings, projected playoff odds, and World Series implied probabilities that the books quietly cross-checked against their own opening lines. The bigger gap between consensus media projection and book number tends to drive heavier early handle, and the Dodgers, Yankees, Phillies, and Braves ended up carrying the bulk of the early prop volume on pitcher strikeouts and home-run-or-more markets. None of this is a hidden trading craft anymore. The signal is now part of the public record on every big league launch.

Hold percentages, regulation, and the friction between them

The interesting policy fight in 2026 is over hold. Books earn substantially more per dollar of handle on parlay and prop activity than on straight markets, which is why menus look the way they do. State regulators have started asking whether the higher hold reflects fair pricing or product complexity that punishes inexperienced bettors. Colorado's proposals lean toward the second reading. New Jersey's at-risk-player triggers do too. The UK package treats the question as already settled. Operators argue that the hold reflects the cost of running the live-trading apparatus and the risk of correlated parlay legs. The argument is going to keep running through 2026 and into 2027.

FanDuel and DraftKings still set the floor

Two operators continue to do most of the work in the US market. FanDuel posted a New York March 2026 online hold above 12 percent, and DraftKings held above 10 percent on a 2.33 billion dollar statewide handle. BetMGM, Caesars Sportsbook, and Fanatics Sportsbook trail in share but have all expanded their player-prop trees during the past year. ESPN BET, after the Penn-Disney rebrand, has leaned heavily into prop-led product positioning. The market share story has been steady. The product story has been the one moving fast.

The international parallel: Kambi, OpenBet, Latin America

Outside the US, the player-prop shift looks similar but slightly behind. Kambi serves European and Latin American partners, with the Caesars-Italy and Latam-Loto deals adding incremental volume during 2025 and 2026. OpenBet powers the tier-one UK and Australian operators and has pushed into the Brazilian regulated market post-launch. Brazil's regulated framework, in force since the start of 2025, is producing the fastest prop-menu expansion in the region as licensed operators race to onboard NFL, NBA, MLB, and global soccer markets. Mexico, Colombia, Argentina, and Peru sit one step behind on the same trajectory. The pattern repeats. Build the data layer first, then let the menu grow.