The 23-year-old Baez was placed on the 15-day disabled list with a left thumb contusion on Opening Day (retroactive to March 25) and batted .267 (4-for-15) with a homer and RBI during his four-game rehab assignment with Triple-A Iowa. Baez batted .289 (22-for-76) with six doubles, one home run and four RBI in 28 games with the Cubs last year.
Baez was originally selected by the Cubs in the first round of the 2011 Draft (ninth overall) and made his major league debut with the club in 2014, smacking nine home runs in 52 games in his rookie season.
Kawasaki, 34, saw action in two games with the Cubs during his stint and went 1-for-2 with a stolen base. He was Iowa's Opening Day shortstop on April 7 before being recalled to Chicago a day later.