The first of the weekend’s two FA Cup semifinals is staged at Wembley Stadium on Saturday, Manchester City journeying to the capital for their showdown with second-tier Southampton. The Premier League leaders, who have reached the last three finals, are naturally significant favorites to reach the showpiece event, where they will face either Chelsea or Leeds United if they progress. However, Southampton are brimming with belief, 20 matches unbeaten and still overjoyed by dumping Arsenal out of the FA Cup at the quarterfinal stage. The anticipation is that City will waltz into the final, teeing them up to complete a domestic treble that appeared incredibly improbable at the turn of the year. But Southampton will look to channel the magic of the world’s oldest cup competition, the Saints desperate to pull off one of the all-time shocks. Here’s how to watch an enticing affair at Wembley. What Time Does Man City vs. Southampton Kick Off?…