PHILADELPHIA -- The Clemson track and field program had two athletes make their way into the school record book on Thursday at Penn Relays. Brynne Sumner and Maddie Dinneen both set impressive personal bests on their way onto top-10 lists. While only a few Tigers competed on the opening day of the relays, most of the team will make their meet debut on Friday. Action begins at 11:55 a.m. with the women's distance medley relay, and will run through 6:25 p.m. concluding with the men's sprint medley relay. THURSDAY HIGHLIGHTS Brynne Sumner set a massive PR in the 1500 meter run, finishing the race in 4:20.96. That time is sixth-best in Clemson history and puts Sumner on her second top-10 list of the season. She holds the No. 7 spot in the 800 meter run. Maddie Dinneen' 10:41.77 time in the 3000 meter steeplechase puts her at No. 4 in school history. It is a huge improvement from her previous personal best of 10:49.43. Marie Forbes finished fourth in the women's hammer throw with a mark of 62.34 meters. Lashanna Graham finished second in the 400 meter hurdles with a time of 56.62, just .08 seconds off her personal best.