Stanislas Wawrinka ran into a spot of bother but stayed on track for the ATP World Tour finals by seeing off Spain’s Feliciano Lopez 6-3 3-6 6-3 in the second round of the Paris Masters on Wednesday. Three tickets remain up for grabs, with Rafael Nadal, Novak Djokovic, David Ferrer, Juan Martin del Potro and Tomas Berdych having already qualified. World number four Andy Murray of Britain has pulled out because of back surgery. Wawrinka’s victory means that Spaniard Nicolas Almagro is ruled out of the race.