Daily MLB Expert Picks & Baseball Predictions May 21

Josh Inglis - Betting Analyst at Covers.com
Josh Inglis • Betting Analyst 13+ years betting experience
Updated: May 21, 2026 , 11:23 AM ET • 4 min read

The Nats and Mets mailing it in, en route to an Under, leads off our expert picks today, followed by a trio of moneyline value picks.

MLB expert picks May 21 Cade Cavalli
Photo By - Reuters Connect. Washington Nationals pitcher Cade Cavalli (24) throws a pitch.

It's a condensed schedule on a Thursday getaway day, but our expert MLB picks have still found a quartet of prices showing strong value at Polymarket.

See why our baseball experts love the Braves, Jays, and A's to come out victorious tonight... as well as the Mets and Nats going through the motions this afternoon.

MLB expert picks for today

Pick Odds
Josh Inglis Josh Inglis: NYM/WAS u8.5 -117
Jon Metler Jon Metler: TOR ML +133
Neil Parker Neil Parker: ATL ML -133
Joe Osborne Joe Osborne: A's ML -104

Prices courtesy of Polymarket.

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Josh Inglis' expert pick: Mets/Nationals Under 8.5

Price: 54¢ (-117) at Polymarket

Let’s hammer the getaway Under with the New York Mets heading to Miami on Friday and the Washington Nationals traveling to Atlanta tonight. The weather is working in the Under’s favor as well, with 10-mph winds blowing in, 60-degree temperatures, and some projected rain in the mix. Neither team is likely eager to grind through a getaway-day game, and we could see some quick at-bats with both clubs having all of their high-leverage bullpen arms available. THE BAT also backs the Under with a fair price of -153 and just 7.56 projected runs.

Jon Metler's expert pick: Blue Jays moneyline

Price: 43¢ (+133) at Polymarket

Braydon Fisher will open for the Toronto Blue Jays, with Spencer Miles expected to handle the bulk of the innings afterward. At 43 cents, I’m more than willing to back Toronto against the New York Yankees, as I make the Blue Jays closer to 49-cent (+104) underdogs tonight. Toronto is expected to roll out a lineup featuring eight right-handed bats against Carlos Rodón, who has yet to look sharp since returning from injury, sporting a 5.63 ERA through his first two starts and still likely on a restricted pitch count. His fastball-slider combination has historically been vulnerable to right-handed power, and that issue becomes even more concerning when he isn’t at his best. The top of Toronto’s lineup, led by George Springer and Vladimir Guerrero Jr., is also very familiar with Rodón, giving the Blue Jays another edge offensively.

Neil Parker's expert pick: Braves moneyline

Price: 57¢ (-133) at Polymarket

Atlanta Braves starter Spencer Strider has allowed a single run on just four hits, while holding opposing hitters to a pedestrian 27.3% hard-hit rate, across his past two starts, and I’m anticipating him keeping the good times rolling against a ho-hum Miami Marlins lineup. The Marlins rank 19th in wOBA against right-handed arms, and Miami also ranks 20th in both overall ISO and xwOBA over the past two weeks. Of course, Atlanta has been a force at the dish all season and sits second in both runs per game and wOBA against righties.

Joe Osborne's expert pick: A's moneyline

Price: 51¢ (-104) at Polymarket

This is a great number on the Athletics tonight vs. an Angels team that has lost eight of its last nine games, with the offense bordering on embarrassing. Jose Soriano is crashing back to earth, allowing 12 earned runs and 24 baserunners across his three May starts, while Luis Severino’s numbers remain respectable outside of Sacramento, where he owns a 3.57 ERA. The biggest edge comes offensively, with the A's ranking fourth in OPS over the last two weeks... and the Angels sitting at 27th. LA’s bullpen has also been a disgrace, ranking 29th in both ERA and FIP during that span.


More MLB best bets for today

Pick Odds
Pirates ML -125
Read analysis in our Pirates vs. Cardinals predictions
Guardians ML +100
Read analysis in our Guardians vs. Tigers predictions

Odds are correct at the time of publishing and are subject to change.
Not intended for use in MA.
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Josh Inglis - Covers
Betting Analyst

Josh Inglis is a rising star in the sports betting content space, specializing in MLB, NHL, and NFL markets. Since joining Covers in 2019, Josh has focused his betting expertise on player props and derivative markets, finding them easier for beating the closing line compared to sides and totals. His engaging analysis and content have been showcased on major networks such as TSN, VSiN, BetMGM Network, and NBC. Josh is a prolific bettor, tracking over 2,500 bets annually and he consistently shares his results through monthly transparency reports. At Covers, he is renowned for his MLB release shows and NHL Puck Props, which are integral parts of the site's live content lineup.

Before his tenure at Covers, Josh spent a decade teaching while pursuing sports media on the side. He has also contributed to live global senior-level broadcasts for the WBSC.

Josh advocates for sports bettors to bet early, emphasizing the importance of securing better numbers by beating the public to the market. He also advises having multiple sportsbook accounts to ensure access to the best possible odds.

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