CHICAGO -- Closer Huston Street took another significant step toward returning from the disabled list on Wednesday when he threw a bullpen session at Wrigley Field.

If Street -- on the disabled list since May 5 with a strained right lat muscle -- feels fine Thursday, and the Padres expect he will, he will begin a rehabilitation stint with Class A Lake Elsinore on Friday.

Street threw a bullpen session on Sunday in New York, but Wednesday's workout was more intense, said manager Bud Black.

"He'll throw all his pitches at a high intensity to prepare for a game," Black said before Street's session.

Street had a 0.93 ERA in 10 games, with four saves in four opportunities, before landing on the disabled list. Dale Thayer, his replacement, has successfully converted all five of his save opportunities.

Jones getting acclimated as bullpen assistant

CHICAGO -- In his first two weeks filling in as bullpen assistant for the Padres, Jimmy Jones had noticed a steep learning curve that caught him a little by surprise.

"It's a little more difficult than I thought," Jones said, "There's a little more work to do. A lot more prep work. That's been the biggest adjustment, figuring out what the pitchers do, what the hitters do on the other team."

"When you're doing your prep work, you've got to know those guys. So it's been a lot of reading and watching video."

On May 16, the Padres announced that Jones would be a bullpen assistant while bullpen coach Darrel Akerfelds is away, continuing his fight with pancreatic cancer.

Jones is in his fourth season as a pitching coach in San Diego's organization. The Padres selected him third overall in the 1982 First-Year Player Draft, and he pitched in the Major Leagues for eight seasons.

Jones said that he's learned a lot from the coaching staff, specifically pitching coach Darren Balsley as well as bullpen catchers Justin Hatcher and Griffin Benedict.

"They all know the league well and they've been around," Jones said. "And they knew these pitchers. They've been a wealth of information for me."

Jones said the primary difference between coaching in San Antonio and being part of a big league staff essentially is the volume of data and video that's available and used prior to each game.

"Coming from Double-A, you don't have nearly as much data," he said.

Short hops

• Center fielder Cameron Maybin didn't start for the fourth consecutive game on Wednesday, though if the Padres got in a pinch, he probably could hit. Chances are good the team will allow Maybin to rest his sprained right wrist two more days -- the team is off on Thursday -- before the Padres begin a three-game series at Petco Park on Friday against the D-backs.

"It's been three days," Maybin said before Wednesday's game. "But it feels like two weeks."

• Pitcher Jason Marquis, who signed a Minor League contract with the team on Tuesday, will make his system debut on Thursday pitching for Double-A San Antonio. Marquis, 33, was released by the Twins on Monday after going 2-4 with a 8.47 ERA in seven starts.