FA Cup: Arsenal at Southampton, 11:30 a.m. Saturday, FS1. Only two of the FA Cup’s fourth-round matches involve a pair of Premier League teams, and this is the only one involving two decent teams. Earlier this year, Southampton knocked Arsenal from the League Cup in the quarterfinals. Can it achieve the double and beat the Gunners in both cup competitions?


FA Cup: Wigan at Manchester United, 10 a.m. Sunday, FS1. It won’t be a long drive for the away fans; Wigan is effectively a northwest suburb of Manchester, making this one of the nearest rivalries in the fourth round. It’s been an ugly season for the visitors, who are flirting with relegation in the second division. But they have won three consecutive matches entering this one.


La Liga: Real Sociedad at Real Madrid, 1:45 p.m. Sunday, beIN. Second-place upstart Sevilla has dominated the headlines in Spain this year, but in some ways Real Sociedad has been the hipster’s choice of the Spanish challengers this year, having risen to a tie for fourth. The visitors would dearly love to continue Real Madrid’s mini-slide. Even a tie would feel much like a victory.


International friendly: United States vs. Serbia, 3 p.m. Sunday, ESPN2. Both the USA and Serbia’s domestic leagues are in the middle of their winter breaks, thus giving domestic players for both national teams an opportunity to train together and shake off a bit of rust. Bruce Arena will be looking for positive signs from his struggling side as he makes his return as USA coach.