Pro cyclists from 20 countries will return to Philadelphia on Sunday for the TD Bank Philadelphia International Cycling Championship.

Billed as America's biggest single-day race, this will be the 26th men's race and the 16th Liberty Classic for women.

Here is the schedule of weekend events:

Saturday: 7 a.m. Philadelphia Insurance Time Trials. Registration for this event is at 6 a.m. in front of the Art Museum; one can race against the clock on a five-mile course that starts and ends at the foot of the Art Museum and runs along Martin Luther King Drive.

Sunday: 7:15 a.m. to 8:45 a.m., AstraZeneca Wellness Challenge. Cyclists can ride the same course as the pros, including Kelly Drive, the Manayunk Wall and Lemon Hill, on Sunday morning before the races. Register in advance at www.procyclingtour.com or Sunday beginning at 6 a.m. at the main staging area at Kelly Drive and Sedgely Avenue, just below the Art Museum. The fee is $45 in advance, $55 on the day of event.

Sunday: 8:30 a.m. to 4 p.m., Philadelphia Cycling, Health and Fitness Expo. Check out everything you need to know about cycling, fitness, and sports on the course side of the Benjamin Franklin Parkway.

Sunday: 9 a.m., TD Bank Philadelphia International Cycling Championship; 9:10 a.m., Liberty Classic women's race.

Sunday: 11:45 a.m., Junior PCT Grand Prix. This is open to riders ages 15 to 18 who qualify to compete on a loop between Logan Circle and Eakins Oval. Go to www.procyclingtour.com for details.

Sunday: 12:45 p.m., Cadence Cycling Foundation Sprints. Approximately 40 riders ages 8 to 16 will compete in heats between Logan Circle and Eakins Oval, followed by an awards ceremony.

Sunday: 8 a.m. to end of championship race. TD Bank Family Fun Zone. Looking for something fun to do with the kids between laps? Check out the zone at the base of the Art Museum steps.

Visit www.procyclingtour.com for more information and to buy VIP tickets for access to Champions Row from 8:30 a.m. to 4 p.m.

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