Stewart was acquired from the Blue Jays in the three-way deal that sent Colby Rasmus to Toronto and Edwin Jackson to St. Louis.
This is the second trade of Stewart's career. The first came back in 2009, when he was shipped from Cincinnati to Toronto for Scott Rolen. Stewart was drafted in the third-round back in 2008 out of Texas Tech, where he emerged as one of the top relievers on the Red Raiders squad.
After signing with the Reds, Stewart finished out the 2008 season pitching out of the bullpen, to great reviews. The next season, Stewart began in the rotation of the High-A Florida State League.
Starting for the first time, he looked brilliant, posting a 4-1 record, a 63-to-18 K:BB ratio and an ERA under 2.00 in 14 starts, the final seven of which came in Double-A.
For the second half of the season, Cincinnati shifted Stewart back to the bullpen to keep his innings down. As a reliever, he earned a promotion to Triple-A, where he looked great.
Then came the trade to Toronto. The Blue Jays let him finish out the season in the bullpen, before switching him to starting full-time in 2010. He looked great in Double-A, posting an 8-3 record and a 3.63 ERA in 26 starts.
The two biggest reasons Stewart thrived as a reliever at Tech were his fastball, which sat 95-97 mph, and a devastating slider. Once he became a professional, Stewart dialed back his fastball to the low 90s.
He now pitches 91-93 as a starter, although he can still reach back for some mid 90s heat on occasion. He's brought along his changeup over the past few years and it's now a serviceable pitch. Stewart has also become an innings eater.
The Jays surprised many by starting Stewart back in Double-A to start the 2011 season. Stewart fought off some ugly starts in May to finish the first half strong, posting a 3.65 ERA and a 25-to-6 K:BB ratio in 24.2 July innings.
That brought his season ERA down to 4.20, improved his win-loss record to an even 5-5 and earned him a spot in the Eastern League All-Star Game.
Stewart was called up to the big-league club during a stretch in June and made three starts for the Jays. His Major League debut couldn't have gone any better, as he pitched seven-innings of two-run ball, striking out four.
He got hit really hard in his second start and then rebounded with another strong effort in his third and final outing.
Since the trade, Stewart has been reassigned to the White Sox Triple-A affiliate in Charlotte. He'll likely get a look in September if the Sox are out of it, and might even play a major role in the Sox bullpen if they are still challenging for a playoff spot.
Expect him to resume his starting duties in 2012, with an eye on earning a rotation spot out of spring training.