Seventh-seeded Bulgarian Grigor Dimitrov and US teenager Ryan Harrison led the youth movement in evidence on Tuesday at the ATP Los Angeles hardcourt tournament. Dimitrov, 20, made short work of two-time Los Angeles champion Tommy Haas, downing the 33-year-old German veteran 6-3, 6-2 in 66 minutes. The Bulgarian arrived in Los Angeles at a career-high 57th in the world rankings and aiming to improve on two quarterfinal appearances on the ATP Tour this year. Harrison, 19, celebrated his move into the world's top 100 with a three-set first-round victory over Richard Berankis. Harrison, who reached his first career semifinal in Atlanta last week, rallied from a set and a break down to notch a 6-7 (4/7), 7-5, 6-3 victory over Lithuania's Berankis, who is