MLB Best Bets Today: HR Props, K Picks & Sharp Signals — May 21, 2026

Welcome to today’s MLB best bets for Thursday, May 21 — your daily roundup of the top home run props, pitcher strikeout picks, NRFI plays, and sharp money signals. It’s a short 7-game slate today (a getaway-day schedule), so the edges are concentrated — fewer games, but a couple of strong standout plays.

The headline is David Peterson’s +3.42 K edge in a 4:05 PM day game at Washington — the biggest strikeout edge we’ve flagged all week, with the model projecting 7.9 Ks against a 4.5 line. On the power side, Aaron Judge (25.2%) tops a flatter HR board, but Yankee Stadium has the wind blowing out tonight (+4.4% HR rating), so the conditions cooperate. And there’s a clean Strong NRFI in that same Yankees game (Braydon Fisher vs Carlos Rodón, 70 score).

Below you’ll find today’s top plays across all categories, sharp money signals, the standout Kalshi edge (Ketel Marte at +28.1% EV), and a featured 4-leg parlay. Confirm via today’s MLB lineups and the MLB weather report before locking in.

David Peterson is the play of the day. A +3.42 K edge is the largest single-prop strikeout edge we’ve surfaced this week — the model projects 7.9 Ks against a 4.5 line, a nearly 3.5-strikeout gap. It’s a 4:05 PM day game at Nationals Park, so it resolves early. If you’re building a single-leg play rather than the full parlay, this is the one with the cleanest model support on the board.

The HR board is flatter today — that’s a matchup story. The top HR% is just 25.2% (Judge), well below the 35-40% leaders earlier in the week. That’s because today’s pitching matchups are tougher across the board — Sandy Alcantara, Luis Severino, and José Soriano are all quality arms. Lower ceiling means the value plays matter more: check the Kalshi Edge Finder, where Ketel Marte stands out at +4.5 pp / +28.1% EV (book fair 20.5% vs Kalshi 16¢) at Chase Field. That’s a bigger expected-value gap than any single HR% number today.

Yankee Stadium wind flipped back to a tailwind. Two days ago it was blowing in at 15 mph with rain; tonight it’s a 5 mph tailwind, clear skies, +4.4% HR rating. The conditions now lightly favor Judge and Rice. The market has already adjusted — Rice’s HR price shortened from +385 to +330 on the movers board — so you’re not getting opening value, but the spot is live.

One Strong NRFI, and it’s in a marquee game. The NRFI board shows a single Strong rating: Blue Jays at Yankees (70 score), Braydon Fisher vs Carlos Rodón. Both starters carry 100% 2026 NRFI rates. Fisher’s career sample is tiny (1-0), so lean on Rodón’s track record as the anchor. Calm Bronx conditions help an early-inning under. DraftKings -135.

Short slate = bet selectively. Seven games means fewer spots, and three of today’s marquee games are afternoon starts (Mets/Nationals 4:05, plus the usual late West Coast trio). Don’t force volume on a getaway day — the Peterson K and the Fisher/Rodón NRFI are the two highest-conviction plays. Confirm everything via today’s lineups and cross-reference BVP matchups on the HR props.