AFP Sports Agenda for Wednesday, May 5 (all times GMT): + Chelsea host Real Madrid in Champions League semi-final + Top seeds Nadal, Barty in action at Madrid Open FOOTBALL -- Chelsea host Real Madrid in the second leg of their Champions League semi-final at Stamford Bridge with the tie poised at 1-1 (1900). Coverage by Steve Griffiths. Picture (FBL-EUR-C1-ENG-ESP-CHELSEA-REALMADRID) - Build-up to Europa League semi-final second legs between Villarreal and Arsenal, and Roma and Manchester United (FBL-EUR-C3) TENNIS -- At the Madrid Open, five-time winner Rafael Nadal takes on teenage wildcard Carlos Alcaraz in his opening match while women's top seed Ashleigh Barty meets Petra Kvitova in the quarter-finals. Picture (TENNIS-ATP-WTA-ESP) -- WTA also at St Malo (TENNIS-WTA-FRA) BASKETBALL -- Nine games in the NBA. Picture (BASKET-NBA) afp