Wasn't much of a duel, Wang pitched a 2 hitter complete game while Buchholz fell apart mid way.
Umm, he gave up 4 hits and 1 run over 6 innings.. that's not falling apart. They pulled him after 6 because his pitch count was 98. It's still early in the season and he's still going to be limited to only 180 innings this year anyways.
Pitchers giving up a combined 6 hits and 2 runs through 6 innings is definitely a pitchers duel (at least until the bullpen blew it).