It was upset Thursday in the Hacienda League with West Covina knocking off league-leading Bonita, 4-3. Despite the loss, the Bearcats remain in first at 17-7 and 6-2 in league while the Bulldogs stayed in playoff contention improving to 13-9 and 5-5. Los Altos couldn’t take advantage, getting swept by Walnut 10-8 and dropping to 12-12 and 4-4. Walnut is now 13-10-2 and 4-4. Diamond Bar is the big winner without playing, remaining 14-8 and 5-3 and only a game back of Bonita.