Former TCU runner Khadevis Robinson of Fort Worth, at age 36 back in the Olympics for the first time in eight years, didn't make it out of the first round of the men's 800-meter run Monday.Robinson, whose second place in the U.S. Olympic Trials was a surprise, finished fourth in his heat -- and 25th overall -- in qualifying in 1:47.17.The other two U.S. runners in the event, Nick Symmonds (Boise, Idaho) and Duane Solomon (Lompoc, Calif.) won their heats to reach the semifinals.In the women's shot put, former Red Oak High and University of Texas star Michelle Carter finished sixth in the finals with a 63-83/4 effort. She was 15th in the 2008 Beijing Games and had been fourth after qualifying throws Monday.Women's pole vaulter Jenn Suhr of the U.S. took gold, clearing 15-7 to edge Cuba's Yarisley Silva on fewer misses. Yelena Isinbayeva of Russia took bronze, failing to become the first woman to win the same individual track and field event at three consecutive Olympics. Gymnastics: Gabby Douglas, the women's all-around champion who also helped the U.S. to team gold, finished last on uneven bars. Russia's Aliya Mustafina rallied to the victory. Boxing: Flyweight Marlen Esparza and middleweight Claressa Shields clinched the first two U.S. boxing medals. Esparza patiently outboxed Venezuela's Karlha Magliocco, and the 17-year-old Shields closed furiously in an 18-14 win over Swedish veteran Anna Laurell. Men's volleyball: David McKienzie scored 17 points and the defending champion U.S. men's team clinched a top tournament seed by beating Tunisia 25-15, 25-19, 25-19. The Americans play a quarterfinal against Italy on Wednesday.