Rapid Reaction: Arizona 77, Memphis 75

TULSA, Okla. -- Derrick Williams came to the rescue defensively for Arizona, blocking a Wesley Witherspoon layup in the final seconds to preserve a thrilling 77-75 victory for the Wildcats. Williams won a game in similar fashion against Washington during the regular season. This was a sensational game that was tight the whole way, with neither team able to pull away.

Turning point: With Memphis up five and nine minutes remaining, Arizona put together a 15-5 run to take the lead and never relinquish it.

Key player: Williams, who finished with 22 points and 10 rebounds, made all nine of his foul shots and, of course, had the game-saving block.

Key stat: Arizona was 26 of 31 at the foul line, and that even includes two missed with :00.4 left by Jamelle Horne.

Miscellaneous: Memphis was led by Antonio Barton with 17 points. Freakishly quick point guard Joe Jackson was once again high-risk/high-reward, with four assists and five turnovers.

What's next: Arizona plays No. 4 seed Texas Sunday. Memphis hopes all its talented young players stay in school.