College Basketball Bubble Watch

Updated: February 19, 2009, 2:59 PM ET
By Mark Schlabach |

Glass looking half-full for Pac-10's tourney prospects

Editor's note: This file has been updated to include all games through Wednesday, Feb. 18.

The Pac-10 regular-season title is no closer to being decided -- though Washington and UCLA may provide some clarity after their meeting tonight -- but the NCAA tournament picture out West is becoming much clearer. Arizona State entered "lock" status this week on the heels of a four-game winning streak, while the Sun Devils' in-state counterparts, the Arizona Wildcats, inched closer with a seven-game win streak of their own, joining Cal to move within reaching distance of the Big Dance. The picture is less rosy for USC, which still has plenty of work to do, but the league is looking more likely to see at least 50 percent of its teams smiling on Selection Sunday.

Butler, meanwhile, received a rare demotion from its "lock" status after a head-scratching couple of losses to Loyola (Ill.) and Milwaukee, trimming the Bulldogs' once-dominating position in the Horizon to just a one-game lead.

Here is this week's Bubble Watch: