Rams rookie review: Preseason week 3

EARTH CITY, Mo. -- A look at playing time and production of each of the St. Louis Rams' drafted rookies and a quick glimpse at the undrafted rookie class in Saturday's 33-14 win against the Cleveland Browns.

OL Greg Robinson, first round, No. 2 overall: Robinson didn't start against the Browns, mostly because his head is still spinning a bit as he tries to learn multiple positions. But he came in at left guard soon enough and played 58 snaps, most on the team. The Rams will try to get Robinson settled in at guard over the next couple of weeks so he can be ready for the opener.

DT Aaron Donald, first round, No. 13 overall: Donald had a strong third quarter, flashing the pass rush potential that has had many buzzing about him during camp. He played 24 snaps on defense and finished with two tackles, a sack and a forced fumble.

DB Lamarcus Joyner, second round, No. 41 overall: Joyner remains one of the busiest rookies on the team, playing 22 defensive snaps and seven more on special teams. Coach Jeff Fisher acknowledged him as the likely primary nickelback, and he handled that role against the Browns. The unofficial pressbox statistics had him down for a couple of tackles.

RB Tre Mason, third round, No. 75 overall: Mason continues get carries, but hasn't been very productive with them. He played 20 snaps on offense and posted 29 yards on 10 carries. He had 18 of those yards on one run, meaning he gained 11 yards on the other nine carries. He simply hasn't been able to get it going in extended looks during the first three preseason games.

S Maurice Alexander, fourth round, No. 110 overall: Alexander continues to be prominently involved though he only played 16 snaps on defense against the Browns. But he's clearly viewed as a key special teams player as he posted another 11 snaps in Cleveland. Alexander didn't register any stats on the unofficial pressbox numbers.

CB E.J. Gaines, sixth round, No. 188 overall: Gaines returned to the field after sitting against Green Bay, playing 14 snaps on defense and making one tackle. He appears to be in good shape to win a roster spot as the Rams have been taking longer looks at other corners.

QB Garrett Gilbert, sixth round, No. 214 overall: Gilbert was the fourth quarterback in against the Browns, playing 13 snaps and attempting just two passes. He completed one of them, for 23 yards, but that was it for him on the night. Austin Davis continues to offer more promise.

OT Mitchell Van Dyk, seventh round, No. 226 overall: Opportunities were few and far between for Van Dyk, who played six snaps on offense and five on special teams against Cleveland. He remains a long shot to land on the 53-man roster.

S Christian Bryant, seventh round, No. 241 overall: Bryant returned to his home state to play 12 snaps on defense and six more on special teams. He had one tackle in those limited chances.

DE Michael Sam, seventh round, No. 249 overall: Sam's snaps have dwindled some, down to 19 against the Browns. But he made the most of the ones he got, coming up with two tackles, two sacks and two quarterback hits.

C Demetrius Rhaney, seventh round, No. 250 overall: Rhaney is still recovering from a knee injury and did not play.

Undrafted rookie roundup: Running back Trey Watts continues to make a strong impression, rushing for 36 yards on nine carries with a touchdown while playing 24 snaps on offense and six more on special teams. ... Defensive lineman Ethan Westbrooks played the most snaps of any defensive player with 38, adding three more on special teams. He played inside and out and had a tackle and batted a pass. ... Cornerback Marcus Roberson also continued getting extensive work in Cleveland, playing 24 snaps on defense and another 12 on special teams. He had two tackles and a fumble recovery.