CLEVELAND — The Lakers were halfway to their most embarrassing loss of the season tonight in the final game of their seven-game trip. Pau Gasol scored 20 points and grabbed 12 rebounds, but Andrew Bynum scored two points on 0-for-7 shooting. Kobe Bryant scored six points on 3-for-8 shooting. Ramon Sessions scored 16 for Cleveland. The Lakers defeated the Cavaliers by 55 points when they played Jan. 11 at Staples Center.