These are five rookies to watch this weekend:
Kelechi Osemele: The offensive lineman has played at right tackle and left guard. His versatility makes him a nice addition to an aging offensive line of Matt Birk (15th season), Bobbie Williams (13th) and Bryant McKinnie (11th). Where he plays Thursday could indicate where Harbaugh intends to use him more to begin the season.
Bernard Pierce: The running back is starting to show why the Ravens moved up in the draft to select him. Pierce has the toughness to run between the tackles but also the speed -- unlike last year's No. 2 starter Anthony Allen -- to bounce outside and turn the corner. Pierce is going to make this roster. But another strong performance could provide the separation he needs to secure playing time next to Ray Rice.
Courtney Upshaw: The linebacker, the team's top pick in the 2012 draft, hasn't bowled over anyone yet. And definitely no opposing offensive linemen. While he had good numbers in college with 8.5 sacks last season, he hasn't given any indication he can be that type of player on this level. He needs to catch the coach's eye to be an every down player.
Deonte Thompson: This team is chock full of receivers, but this undrafted one is close to securing a spot somewhere on the roster. He has shown blazing speed and that he can be a quality returner on special teams to give the Ravens an added dimension. He had a big gain in last weeks' game against the Lions negated by a holding penalty.
Justin Tucker: Sure, he's just a kicker but he has pushed incumbent Billy Cundiff to the brink. Much is being made of Tucker not getting the nod because of his experience but he did kick at Texas. When it comes to the big stage, it doesn't get much bigger and he had better than 80 accuracy there. He has the better leg than Cundiff and this is a pressure situation.