What to watch while deciding between pliers and a wrench ... • MLB: Houston at Chicago Cubs (8 p.m., ET). Carlos Zambrano rocks the chin whiskers. [WGN] • Tennis: U.S. Open, men's fourth round and women's quarterfinals, at New York (7 p.m., ET). The only sport that features balls in a can. [USA] • MLB: Yankees at Rays (7:10 p.m., ET). It's taco-signing time. [Yes] [WXPX]