Zack Greinke entered his Tuesday-night start against the Phillies with something of a cloud hanging over his head.

Two clouds, really.

There was the performance cloud: In his last four starts, Greinke had given up 15 runs in 14 innings. He'd struggled so badly that the Brewers gave him 10 days off between starts. He'd struggled so badly that suddenly there were some questions about his trade value.

There aren't as many questions now. Tuesday night, Greinke pitched seven sterling innings, giving up only three hits and one run without walking anyone at all.

Which brought the second cloud, the cloud of a possible trade, back in force.

Source continues: #Nationals did not scout #Brewers' Greinke last night; appear on periphery at best. #WhiteSox want Greinke badly.

— Ken Rosenthal (@Ken_Rosenthal) July 25, 2012

The White Sox, eh?

The White Sox entered Wednesday's games in a dead tie with the Tigers atop the American League Central. Phil Humber, one of their starting pitchers, now sports a 6.25 ERA. So you can understand why the White Sox might be interested in a pitcher like Zack Greinke.