MLB Player Props & Best Bets for Today, Aug. 19

Colby Marchio - Contributor at Covers.com
Colby Marchio • Betting Analyst 7+ years betting experience
Updated: Aug 19, 2026 , 12:25 PM ET • 4 min read

Pete Alonso over his last 10 games, posting a .947 SLG, .824 xSLG and .447 ISO while generating a 65.6% hard-hit rate and 22% barrel rate. Making him a strong look this evening against the Yankees.

Pete Alonso Baltimore Orioles MLB
Photo By - Reuters Connect. Baltimore Orioles first baseman Pete Alonso (25) acknowledges the dugout and runs the bases after hitting a two run home run

Baseball all day long! We have a full slate ahead, with plenty of value in the MLB player props market.

Join me as I break down three of my favorite MLB picks for Wednesday, Aug. 19, including why I expect Pete Alonso to go nuclear.

For more props, Josh Inglis has you covered with his three favorite MLB home run predictions.  

Best MLB player props today

Player  Pick Odds
Guardians Parker Messick Over 6.5 strikeouts +102
Marlins Griffin Conine To record a hit -154
Orioles Pete Alonso  Over 1.5 H+R+RBI -138
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Parker Messick Over 6.5 Strikeouts (+102)

One of the most exciting young pitchers in the game right now is Cleveland Guardians southpaw Parker Messick, who has the highest average strikeout rate on the slate over at Batters-Box. He also owns the No. 1 pitcher rating while facing a San Francisco Giants lineup that has struggled mightily against left-handed pitching.

So far this season, the Giants own a 23.1% strikeout rate, 76% contact rate and 33.4% swinging-strike rate. On the road against lefties, those numbers take a dive, with a 30.8% strikeout rate, 70% contact rate, and 34.2% swinging-strike rate. Over their last 60 at-bats against a left-handed pitcher, only three hitters have a strikeout rate below 13.3%. Everyone else is above 30%.

Messick has posted a near-30% strikeout rate across his last three outings, setting him up in an excellent spot to shove against an ice-cold Giants lineup. He has also recorded 6+ strikeouts in each of his last four starts.

Do not pay juice for this prop.

  • Time: 6:40 p.m. ET
  • Where to watch: CLEG, NBCSBA

Griffin Conine To Record a Hit (-154)

Miami Marlins outfielder Griffin Conine to record a hit against Philadelphia Phillies right-hander Aaron Nola is mainly a price play.

For starters, Conine is the No. 1-rated hitter on Batters-Box's current-season dataset. Across 26 elite-rated matchups this season, he has recorded at least one hit 61.54% of the time.

The outfielder has been absolutely destroying the baseball lately. He homered last night, and hopefully he can go deep again, but we only need the floor here. Over his last 10 games, Conine owns an .833 SLG and .433 ISO while generating almost a 60% hard-hit rate and a 22.7% barrel rate.

Nola has been tormented by left-handed hitters at home this season, allowing them to hit .314 with a .583 SLG and .407 wOBA. On top of that, lefties are producing a 56% elevation rate and 36.8% hard-hit rate against him.

If you're not in the juice-paying business, take his hits + runs + RBI prop. However, the hit prop is playable to -160.

Check out Quinn Allen's full Marlins vs. Phillies predictions.

  • Time: 6:05 p.m. ET
  • Where to watch: MIAM, NBCSP

Pete Alonso Over 1.5 Hits + Runs + RBI (-138)

It is hard to ignore just how hot Baltimore Orioles slugger Pete Alonso has been over his last 10 games, posting a .947 SLG, .824 xSLG, and .447 ISO while generating a 65.6% hard-hit rate and 22% barrel rate.

Alonso also enters today's matchup with an elite rating on Batters-Box. Across 60 elite ratings over the last three seasons, he has gone Over this prop 68.33% of the time.

Tonight, he draws New York Yankees right-hander Will Warren, who has been allowing a boatload of hard contact to opposing hitters over his last five outings. The last 60 right-handed hitters he has faced are producing a 56% hard-hit rate, 9.3% barrel rate, and 60% elevation rate, all while posting a .479 xBA, .662 xSLG, and .358 ISO.

The trends and recent numbers are too delectable to pass up. Take this down to -140, or grab his 2+ bases at plus money.

Check out Chris Hatfield's full Yankees vs. Orioles predictions.

  • Time: 6:35 p.m. ET
  • Where to watch: YES, MASN, AmazonPV 
Colby Marchio's 2026 Transparency Record
  • Prop picks: 414-799, -5.8 units

Odds are correct at the time of publishing and are subject to change.
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Colby Marchio
Betting Analyst

Colby Marchio is a two-time DePaul alum and former Division 1 (club) baseball player who has been sports betting since 2019. Since graduating in 2021, he has worked throughout the media circuit, hosting and appearing on various television and radio shows while making countless guest appearances discussing Major League Baseball, college basketball, college football, and the National Football League.

A self-proclaimed numbers nerd, Colby may enjoy digging through the data even more than winning itself. That passion is why his two favorite sports to cover are college basketball and Major League Baseball. 

As for his favorite sportsbook, it is whichever one has the best price, or whichever one is not taxing him as an Illinois resident. 

You can find all of his plays and more @ColbyMBets on Twitter/X.

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