The “Royals vs. Mariners” market on Polymarket lets you trade on the outcome of the MLB game between the Kansas City Royals and the Seattle Mariners, scheduled for May 22, 2026 at 7:40 PM ET. The primary market is the moneyline — which team will win the game — where Mariners is currently priced at 50¢ (50% implied probability) and Royals at 50¢ (50%). Beyond the moneyline, sports markets on Polymarket may feature spreads, totals (over/under), and player props, giving you multiple ways to trade on this game. Prices reflect real-time crowd-sourced probabilities. Shares in the correct outcome pay out $1 each when the market resolves after the game ends.

As of now, the “Royals vs. Mariners” market has generated $NaN in total trading volume across all market types (moneyline, spreads, totals, and player props). This volume reflects active engagement from the Polymarket trading community, and a deeper pool of traders generally means more informative, reliable odds. You can track live price movements and trade on any market directly on this page.

To trade on “Royals vs. Mariners,” start by choosing the market type you want to trade: Moneyline (which team wins), Spreads (margin of victory), Totals (combined score over/under), or Player Props (individual player stat lines). Each market shows the current price for each side — for example, the moneyline shows KC at 50¢ and SEA at 50¢. Select the side you want to trade, choose Buy to take a position or Sell to close an existing one, enter your amount, and click Trade. If your chosen side is correct when the game ends and the market resolves, your shares pay out $1 each. If it’s incorrect, they pay out $0. You can also sell your shares at any time before the game ends to lock in a profit or cut a loss.

The current moneyline odds for “Royals vs. Mariners” show Seattle Mariners at 50¢ (50% implied probability) and Kansas City Royals at 50¢ (50%). All odds update in real-time as traders buy and sell shares, reflecting the latest collective view of how this game will play out. Check back frequently or bookmark this page to follow how the odds shift as game time approaches.

The “Royals vs. Mariners” market resolves based on the official final score of the MLB game as reported by MLB’s official results, including overtime if applicable. Moneyline markets resolve to the team that wins the game. Spread markets resolve based on the final margin of victory relative to the posted line. Totals (over/under) markets resolve based on the combined final score of both teams. Player prop markets resolve based on official box score statistics. If the game is postponed or canceled, the market resolution rules (available in the Rules section on this page) specify how that scenario is handled. We recommend reviewing the full resolution criteria before trading.

Yes. You don’t need to trade to stay informed. This page serves as a live odds tracker for the Kansas City Royals vs. Seattle Mariners game. The moneyline, spread, totals, and player prop odds all update in real-time as new trades come in. You can use the chart to track line movement as game time approaches — shifts in the odds often signal new information like injury updates, lineup changes, or sharp action from big traders. Bookmark this page, check the comments section to see what other traders are saying, and use the time-range filters on the chart to review how the odds have shifted. It’s a free, real-time window into what the market expects.

Polymarket odds are set by real traders putting real money behind their beliefs, which tends to produce well-calibrated probabilities. With $NaN traded on “Royals vs. Mariners,” these prices aggregate the collective knowledge and conviction of active participants — similar to how traditional sportsbooks reflect sharp and public money, but in an open, transparent market anyone can participate in. Prediction markets have a strong track record of accuracy, especially as events approach their resolution. Polymarket’s overall one-month accuracy score is 94%. For the latest stats, visit the accuracy page on Polymarket.

To place your first trade on “Royals vs. Mariners,” sign up for a free Polymarket account and fund it using crypto, a credit or debit card, or a bank transfer. Once your account is funded, return to this page and choose a market type — Moneyline, Spreads, Totals, or Player Props — select the side you want to trade (e.g., KC or SEA on the moneyline), enter your amount, and click Trade. If you’re new to prediction markets, click the “How it works” link at the top of any Polymarket page for a step-by-step walkthrough.

On Polymarket, the price of each side in a market represents the market’s implied probability. A price of 50¢ for SEA on the moneyline means traders collectively believe there is roughly a 50% chance that the Seattle Mariners will win this game. If you buy SEA shares at 50¢ and they win, you receive $1 per share — a profit of 50¢ per share. If they lose, those shares are worth $0. The same logic applies to spreads, totals, and player props: a lower price means a higher potential payout but a lower implied probability of being correct.

The “Royals vs. Mariners” game is scheduled for May 22, 2026 at 7:40 PM ET. Trading remains open and odds will continue to shift as new information emerges leading up to the game. The market resolves once the game concludes and the official final score is confirmed. The exact resolution timing depends on when the game ends, including overtime if applicable.

The “Royals vs. Mariners” market has 6,138 comments where traders share their analysis, debate game outcomes, and discuss breaking developments like injury updates and lineup changes. Scroll down to the comments section to join the conversation. You can also check the Top Holders tab to see how the market’s biggest traders are positioned, or view the Activity tab for a real-time feed of trades being placed.

Polymarket is the world’s largest prediction market, where you can stay informed and trade on real-world events. Traders buy and sell shares on outcomes across politics, sports, crypto, finance, tech, and culture — including MLB events and games. Prices reflect real-time, crowd-sourced probabilities backed by real money, offering a transparent, market-driven alternative to traditional odds sources. Whether you’re a seasoned sports trader or just getting started, Polymarket lets you put your knowledge to work.