The TCU track and field teams begin their postseason with the Big 12 Outdoor Track and Field Championships, Friday through Sunday at the Hart-Patterson Track and Field Complex in Waco.Competition on Friday begins with the hammer throw at 2 p.m. and concludes with the 10,000 meters at 8:15 p.m. Saturday action begins at 3 p.m. with the women’s long jump finals, and the prelims for the 1,500-meter run. Sunday field events begin at 11 a.m. and running events at 4 p.m. with the 4x100-meter relays.“We need to be better than we were at the Big 12 Indoor Championships,” TCU coach Darryl Anderson said. “We have to go into the meet and compete to our ability level. I think we will.”Since the Big 12 indoor meet 10 weeks ago, TCU has benefited from the progress of its freshmen, incluing sprinters Ronnie Baker, Raymond Bozmans and Harvey McSwain. All three are expect to contribute in the 4x100 and 4x400 relays.On the women’s side, Ashley Eckhoff has become a strong component to the TCU distance program with her progress in the 5,000 meters.Longhorns signingTexas added Martez Walker, a left-handed guard from Detroit, to its men’s basketball signing class, coach Rick Barnes announced. Walker, who averaged 20.4 points per game last season for Pershing High School, is the fourth guard in a four-player class that Barnes described as being the culmination of a “concerted effort to improve our skill and athleticism on the perimeter.”Texas’ top two scorers from last season’s 16-18 team, guards Myck Kabongo and Sheldon McClellan, will not return. Kabongo opted for early entry in the NBA Draft, and McClellan has announced plans to transfer.Other guards among Texas’ signees include Demarcus Croaker, Isaiah Taylor and Kendal Yancy. — Jimmy BurchSEC teams with ESPNThe Southeastern Conference and ESPN have announced a 20-year agreement to operate an SEC network that is scheduled to debut in August 2014.SEC Commissioner Mike Slive said the SEC network will produce 1,000 live events each year, including 450 televised on the network and 550 distributed digitally. Slive said the network will carry approximately 45 SEC football games.No financial terms were released for the deal.Briefly • UT Arlington women’s basketball: Coach Krista Gerlich announced the additions of assistant coaches Kristin Cole and Ashley Crawford. Cole played at Notre Dame and spent one season as the assistant under Gerlich at West Texas A&M. Crawford played at Lamar University, where she spent three years as an assistant. • Notre Dame football: The university unveiled a plan to add buildings and more than 3,000 revenue-producing premium seats in and around Notre Dame Stadium in a push to make that area of campus more of a community hub.