Grand Slam Tennis is holding round-robin tournaments at the Cheverus High courts on Saturdays through the summer. For information or to register, go to www.grandslamtennis.net or email grandslamtennis1@yahoo.com.

MCU Portland Phoenix and SZ Phoenix are holding tryouts for their 2011-12 premier soccer and junior academy programs. Tryout dates run from July 6-15. For specific dates and times by age and gender and to register, visit www.mainepremiersoccer.com. For more information, email tryouts@mainepremiersoccer.com.

The Maine Tennis Association championships will be held July 8-10 at the Waynflete tennis complex in Portland. The tournament is sanctioned as a double major by the MTA. It is open to players of all ages and abilities, with competition in men’s and women’s open singles and doubles, as well as men’s singles in 35-and-over, 45-and-over and 55-and-over divisions. For more information or to register, contact Don Atkinson at 772-7350 or datkinso@maine.rr.com. The entry deadline is noon July 7.

Portland Trails board members Mark Goettel and Andy Abrams will offer a preview to the Portland Trails 10K Trail to Ale as part of the Portland Trails Discovery Trek Series. Runners are invited to meet at Ocean Gateway Terminal and run the 10K course. The preview will give runners an idea of what to expect on the day of the race, to be held on Sept. 18. Admission is free for Portland Trails members, $5 suggested donation for non-members. Reservations are suggested. Call Portland Trails at 775-2411.

The Urban Epic Challenge, presented by Oxford Networks, will be held on Saturday on the Portland waterfront. The 4.5-mile course starts on the East End Trail and features obstacles designed with the input of industry experts from the worlds of fitness, outdoor recreation, mountain operations and the military. Registration is $45 until Thursday and $50 on Friday and Saturday, if spots are still available. For more information or to register, visit www.urbanepicchallenge.com.