Answered June 18th, 2019

Pete Alonso went 4-4 with a homer, 3 RBI, 3 R and 2 BB in 6 plate appearances on Tuesday. He's just the third rookie (and first since 1995) in Mets team history to reach base every time in a game with 6+ PA.

which mets rookie has the best obp in a game with at least 6 PA
Interpreted as:
Which mets rookie has the best obp in a regular-season game with at least 6 PA?