Three of the most disappointing MLB players of the 2025 season

Semien's struggles

Marcus Semien has been nothing short of a force since joining the Texas Rangers, but he is showing major signs of regression in the first half of 2025. 

While being mainly a defense-first second baseman, his hitting numbers across the board have taken a major hit, as he's posting a career-worst .641 OPS through 71 games thus far.

Semien's bat speed is way down in the 10th percentile (68.6 mph), and both his average exit velocity (88.5 mph) and hard-hit percentage (38 percent) all point towards him not hitting the ball hard enough as the key behind his struggles. 

The 34-year-old is no stranger to long seasons, though. He has played in 159+ games each season over the past four years and has been playing much better over his past 30 games (.294/.373/.471). If this is any projection for the second half of his season, concerns over his regression could be forgotten.

Robert's rough first half

Luis Robert Jr. is one of the main contributors that the Chicago White Sox have left on their team, but his play to start 2025 has been nothing short of disappointing. 

The 27-year-old outfielder has taken a major step back this season, slashing .194/.279/.311 and posting a .590 OPS, the sixth-worst OPS in the league among qualifying hitters. 

The one-time All-Star is displaying most of his struggles through his unbelievably high strikeout rate (31.5 percent), showing that he is chasing and whiffing at a much higher clip than he should be.

Although Robert is posting very underwhelming numbers over the past season-and-a-half, it won't stop him from once again being looked at as one of the most sought-after trade pieces at the deadline this season.

The MLB season is a grueling 162-game marathon, and bad first halves can happen even to the game's best. It will be interesting to see what the second half holds for these players and if they can erase their first-half woes.