1. QB Jameis Winston
Winston heads into Saturday's game against Jacksonville having already tested, and had success against, the Jaguars' defense. Throughout the Bucs' two joint practices with the Jaguars, Winston has looked sharp, particularly during Thursday's two-minute drill when he helped Tampa Bay drive the length of the field and finish with a score. It will be interesting to see what the Jaguars try to throw at Winston in an attempt to knock him off his game.
2. CB Brent Grimes
Since the Bucs' last preseason game, Grimes has been perhaps the most impressive Buccaneer in practice. He thrived against Jacksonville, recording a head-turning, one-handed interception on Wednesday. But Grimes looked good when the Bucs were practicing in Tampa, too. Keep an eye on him matched up against Allen Hurns, who was one of the league's top receivers a year ago.
Pictures of the Buccaneers' training camp practice in Jacksonville on Thursday.
- RB Charles Sims**
It's always a question as to how long the starters will play in the preseason. Sims is technically the No. 2 running back but serves a role similar to a starter, handling many of the third-down responsibilities for the Bucs. Keep an eye on how long Sims plays, or whether he and Doug Martin split time with Mike James working with the second team. This will be Sims' first preseason game after he sat out the Bucs' opener.
4. DE Jacquies Smith
Smith stood out against the Eagles in Week 1 of the preseason, and the Jags had trouble blocking him during joint practices. In fact, both Jacksonville and Philadelphia had issues containing the Bucs' pass-rushers. Smith serves a key role as a pass-rusher for the Bucs and is the next-man-up at defensive end after Will Gholston and Robert Ayers.
WATCH: ONE-ON-ONE WITH JAMEIS WINSTON[
](http://www.buccaneers.com/videos/videos/Watch-1-on-1-with-Jameis-Winston/4a7648de-6e07-4902-b756-20c3ba38d479)5. TE Austin Seferian-Jenkins
Seferian-Jenkins was dominant in the red zone during Thursday's practice, catching three touchdowns. Since the Bucs' first depth chart revealed Seferian-Jenkins to be the second-team tight end, he's performed well in practice, including hauling in an impressive, one-handed catch during practice at One Buc Place last week. Keep an eye on whether or not Seferian-Jenkins gets any reps with the first-team against Jacksonville.