He is 0-1 with a 4.91 ERA and 17 strikeouts in 11 innings (three starts) with Triple-A Round Rock.
Scherzer, who turns 40 July 27, was 4-2 last season with a 3.20 ERA in eight regular-season starts for Texas after being acquired from the New York Mets at the trade deadline.
He did not pitch in the wild-card or division series because of a shoulder strain and was 0-1 with a 9.45 ERA in two starts in the American League Championship Series. He started Game 3 of the World Series and pitched three scoreless innings in a 3-1 win against the Arizona Diamondbacks.
A three-time Cy Young Award winner and an eight-time All-Star, Scherzer is 214-108 with a 3.15 ERA and 3,367 strikeouts in 457 games (448 starts) for the Diamondbacks, Detroit Tigers, Washington Nationals, Los Angeles Dodgers, Mets and Rangers.