ST. PETERSBURG, Fla. (AP) — Tampa Bay Rays infielder Wander Franco, considered the best prospect in the minors, is set to make his major league debut.

The Rays say they plan to promote the 20-year-old Franco from Triple-A Durham tonight. Tampa Bay is off Monday and hosts the Red Sox tonight.

Franco is a .332 hitter with 145 RBIs in three minor league seasons.

Franco went 5 for 17 with a long home run in seven spring training games for Tampa Bay this year.

The Rays had the best record in the majors this year until their current six-game losing streak.