Arsenal, Chelsea, Valencia, Frankfurt in Europa League SFs

Chelsea scored three early goals before surviving a second-half scare to advance to the semi-finals of the Europa League yesterday with a 4-3 home win over Slavia Prague, and Arsenal beat Napoli 1-0 to make the last four for the second straight year.In the other second-legged quarter-final games, Valencia won 5-1 on aggregate after defeating Villarreal 2-0, and Eintracht Frankfurt overturned a two-goal deficit from the first leg. The German team went through on away goals following a 2-0 home victory over Benfica and 4-4 overall.Chelsea enjoyed a 4-1 lead at half-time before conceding two goals after the interval for a 5-3 aggregate win. The London club equaled Atletico Madrid's record run of 15 unbeaten games in the competition.Chelsea play Frankfurt in the semi-finals, and Arsenal, which won 3-0 overall, meets Valencia.For all four semi-finalists, winning the Europa League would secure a route into the Champions League outside of their domestic leagues.Arsenal and Chelsea are currently locked in a tight fight with Tottenham and Manchester United for the last two qualifying spots from the Premier League behind Liverpool and Manchester City.Valencia are sixth in the Spanish league, three points behind Sevilla in fourth. Frankfurt are fourth in the Bundesliga.