Derek Fisher has started every game at point guard for the Lakers. The fourth quarters have usually been the domain of Steve Blake. The backup point guard played all 12 minutes against the Houston Rockets on Tuesday night at Staples Center, helping the Lakers emerge with a 108-99 victory. Fisher never got off the bench in the fourth quarter, continuing a trend in which his understudy has often been on the floor in the final minutes. Blake has averaged eight minutes in the fourth quarter to Fisher's three minutes, with Blake tallying more minutes in the final quarter than Fisher in four of the Lakers' seven games.