Javier Baez probably won't be rewarded with a Sept. 1 promotion to the big leagues but Cubs manager Dale Sveum acknowledged the organization's top prospect has produced "an incredibly impressive year" at Class A Daytona and Double-A Tennessee.

"Sometimes guys put you in situations where you do start thinking about it" said Sveum pointing out President Theo Epstein and general manager Jed Hoyer would make the final decision on such a move. "But I don't see that happening.''

Despite batting .286 with 33 home runs and 100 RBIs in 119 games Baez currently doesn't have a spot on the 40-man roster. The Cubs will have to make room once outfielder Ryan Sweeney likely will come off the 60-day disabled list Sept. 1 when 25-man rosters can be expanded.

Nevertheless Sveum is impressed that Baez 20 the Cubs' first pick in the 2011 draft has elevated his production. Baez is batting .307 with 16 home runs and 43 RBIs in only 43 games at Tennessee and could force his way into consideration next spring.

Baez has committed 41 errors at shortstop but Sveum believes he will improve with experience.

"It's not like he's booting balls" Sveum said. "It's a lot more mistakes like making throws he should make or plays he shouldn't try. A lot of errors like that which we all did at that age. He's making routine plays.

"We're talking about an incredibly impressive year especially what he did in Double A because that's where a lot of prospects and all the good pitching is.''

Battle grounds: The trade of David DeJesus has given former infielder Junior Lake a longer look in center field which isn't the easiest position to play at Wrigley Field because of the wind and brick wall.

"The wind is so different here than any other park" Sveum said of the constant shifting of breezes and gusts. "It comes into play on an everyday basis. It's a learning experience more here than any other ballpark."

Lake made two exceptional running catches Thursday.

At the plate Sveum has seen some subtle improvements from Lake who Wednesday became the first Cubs rookie to hit a double in four consecutive games since Starlin Castro did it Aug. 22-25 2010.