Baseball
Sierra, a 40-year-old switch-hitter who is usually a designated hitter, batted .229 with four home runs and 29 RBIs in 61 games with the New York Yankees last season.
The four-time All Star, who was injured for much of last year, had filled a reserve role with the Yankees since 2003.
Willis, the Longhorns' starter the last two seasons, earned All-Big 12 honors last year when Texas advanced to the Women's College World Series.
-- From wire reports
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