Eight months and four days after it began, the Major League Soccer season could end tonight for Real Salt Lake.Heading into the second leg of their Western Conference semifinal against the L.A. Galaxy (7 p.m., ESPN2) in Rio Tinto Stadium, RSL trails 1-0. If the home team wins by two or more goals, they will advance to the next round.If RSL leads by a single goal at the end of regulation, they will head to overtime and, possibly, a shoot-out.If it's a tie or if Los Angeles has the lead, RSL's season is over.Also tonight, Seattle travels to Portland (9 p.m., NBCSN) for the second leg of their series. Portland leads 2-1; the winner will face the winner of RSL-L.A.Elsewhere on TV ...NFL (6:25 p.m., NFL Network): Washington at MinnesotaThe Big Bang Theory (7 p.m., CBS/Ch. 2): Sheldon feels slighted when Professor Proton (Bob Newhart) seeks advice from Leonard instead of him and he seeks revenge by befriending a rival science TV host, Bill Nye.Once Upon a Time in Wonderland (7 p.m., ABC/Ch. 4): Will Alice use one of her wishes to save the Knave?The Voice (7 p.m., NBC/Ch. 5): There are "live" eliminations tonight ... which are, of course, tape-delayed in this time zone.The X Factor (7 p.m., Fox/Ch. 13): Hopefuls are eliminated.The Vampire Diaries (7 p.m., CW/Ch. 30): Tessa figures out that Silas outsmarted her.Women's college soccer (7 p.m., BYUtv): Pacific at BYUProject Runway All Stars (7 p.m., Lifetime): The contestants create cocktail dresses.The Millers (7:30 p.m, CBS/Ch. 2): Nathan tries to get his parents back together.The Crazy Ones (8 p.m., CBS/Ch. 2): A guy (Josh Groban) Sydney used to work with writes a song about her.Grey's Anatomy (8 p.m., ABC/Ch. 4): The rift between Meredith and Cristina widens.Sean Saves the World (8 p.m., NBC/Ch. 5): Sean lies to Liz and tells her he got rejected.Glee (8 p.m., Fox/Ch. 13): Jake and Bree grow closer.Reign (8 p.m., CW/Ch. 30): Will Mary lie to get out of her engagement, even if it costs a man his life?Women's college volleyball (8 p.m. P12N): Cal at UtahTwo and a Half Men (8:30 p.m., CBS/Ch. 2): Walden begrudgingly agrees to introduce Alan to Lynda Carter.The Michael J. Fox Show (8:30 p.m., NBC/Ch. 5): Mike's sister moves in with the family.Elementary (9 p.m., CBS/Ch. 2): Sherlock's brother, Mycroft, asks for help with a case involving his former fiancee.Scandal (9 p.m., ABC/Ch. 4): Olivia faces a decision that will affect her relationship with the White House.Parenthood (9 p.m., NBC/Ch. 5): Max finds some pictures from Hank and Sarah's past.White Collar (10 p.m., USA): Neal goes under cover.Covert Affairs (11 p.m., USA): Annie goes to New York to follow a lead.