If the Mets weren’t baseball’s biggest disappointment before the All-Star break, at 42-48, they were close. Individual first-half grades for the players — particularly the starting pitchers — reflect much of the problem.

The veteran moved into the closer’s role with Edwin Diaz sidelined and has been almost automatic. Easily could have been an All-Star with his 2.06 ERA and 13 saves.

The 21-year-old rookie wasn’t supposed to be this good already. His bat has won a few games for the Mets and his work behind the plate has been solid.

The lefty reliever owns a 0.90 ERA in his last 24 appearances and has held opposing batters to a .579 OPS during that stretch.

Emerged from a slump after the birth of his second daughter last month and has provided strong defensive play for most of the season.

Got lost in the platoon shuffle early, but has emerged as one of the Mets’ most productive hitters. It’s hard to ignore his .992 OPS since May 28.

A wrist injury decelerated his season, but Alonso’s raw power helped keep the lineup afloat in April and May, in particular.

His power has increased, but did it occur at the expense of on-base percentage? He entered the break in his first real slump of the season.

Walks and the ability to work deep into games were the right-hander’s biggest issue in the first half, but he has shown, in more than a few flashes, that he can be special.

Scuffled early in the season — perhaps with the pitch clock as a factor — but has settled in as a key late-inning option who can close if needed.

Not what the Mets were expecting for $43.3 million this season. But the three-time Cy Young award winner’s 2.70 ERA since June 1 is a reason for optimism.

All-around professional who has adjusted to his decrease in playing time. His ability to get on base and deliver the big hit are valued.

Two rough outings inflated the right-hander’s ERA, but he largely has been dependable as a bridge in the fifth and sixth innings.

The season has been a roller-coaster ride for the right-hander, with a suspension and his slider’s inconsistency contributing to a first half in which he posted a 4.31 ERA.

The right-hander has lacked the consistency to become a true member of Buck Showalter’s circle of trust in the bullpen. He still has the ability to dominate.

The rookie was thrust into the starting role at third base after a torrid stretch in Syracuse, but the Mets are still waiting for the payoff. Baty will have to show improvement from his .669 OPS.

The infielder was optioned to Syracuse for a stretch. His defense has lagged and it hasn’t been his best season on offense.

Was an early surprise who slumped before a demotion to Syracuse. Walks and homers were an issue.

His calf injury brought Alvarez to the major leagues, for which the Mets should be grateful. Since returning, Narvaez has been seen in the clubhouse, but not so much on the field.

The veteran right-hander has struggled to provide the Mets with any kind of length or consistency within the rotation. His 5.16 ERA in 12 starts this season says it all.

The lefty has looked better in three starts since returning from Syracuse, but his early season regression hurt for a team in need of capable replacements for Verlander and Jose Quintana.

A dip in velocity and control issues are not a great combination. The right-hander hasn’t been the same since he returned last season from a shoulder strain.

The 2022 NL batting champion hasn’t brought much to the lineup. If ever there were a time for Lindor to buy his teammate the new car he promised him …

A disappointing season for the veteran, whose OPS has nose-dived since mid-May. The Mets need more power from that spot in the lineup.

His drop-off has been precipitous, both on offense and defense. Will he remain an everyday player in the second half?

The rookie received something of a chance with the Mets, but was mostly buried on the bench before he was returned to Syracuse.

Ultimately, the manager has to share in the blame for the team’s performance — his handling of the bullpen has been far from perfect — but it’s hard to pin the underperformance of veterans on him.

Robertson, Raley and Pham, in particular, were good low-key moves that have worked out. But there’s no escaping the Mets’ lack of volume in the bullpen and the need for another offensive presence.