Barry Bonds / Roger Clemens by BruceM

Question 9

Two answers required. The uniform number Clemens had worn in Boston and Toronto was in use by Paul O'Neill when Clemens became a Yankee. Clemens briefly wore #12 before switching to the number he would wear in Houston and on his Yankee swan song. Give both numbers, in order, with which Clemens began and ended his career.

21, 22