Starters Colin Rea and Justin Hancock and reliever Tayron Guerrero will accompany Jankowski to Corpus Christi for the game.
Jankowski, who turned 24 Monday, is hitting .327 with eight doubles, four triples, a homer, 22 steals, 12 RBIs and 43 runs scored in 58 games for the Missions. He ranks third in the Texas League in batting average, on-base percentage (.403) and steals and second in runs scored.
Rea, 24, who missed a month of the season with back spasms, is 1-2 with a 1.29 earned run average with 50 strikeouts against nine walks in 56 innings.