Oct. 3-9 -- $100,000 Stockton Challenger (men), Eve Zimmerman Tennis Center, University of the Pacific. Qualifying begins Oct. 1. Champions in 2015 (Sacramento): Taylor Fritz, Blaz Kavcic-Grega Zemlja.
Oct. 3-9 -- $25,000 Redding Challenger (women), Sun Oaks Tennis & Fitness. Qualifying begins Oct. 1. Champions in 2015: Heidi El Tabakh, Ashley Weinhold-Caitlin Whoriskey.
Oct. 10-16 -- $50,000 Fairfield Challenger (men), Solano College, Fairfield, Calif. Qualifying begins Oct. 8. Champions in 2015: Taylor Fritz, Johan Brunstrom-Frederik Nielsen.