Basel, Switzerland, Nov 3: Second-seeded Andy Murray withdrew injured and sixth-seeded Janko Tipsarevic retired hurt in the Swiss Indoors on Wednesday.
Murray was due on court Wednesday afternoon in a first-round singles against Robin Haase of the Netherlands, and to partner his brother Jamie in a doubles in the evening.
But Murray strained his right gluteal muscle.
He's on a career-best 15-match winning streak after wins in successive weeks in Bangkok, Tokyo and Shanghai.
Murray's place in the singles draw was taken by lucky loser Marco Chiudinelli of Switzerland.
Tipsarevic retired on serve while trailing Florian Mayer of Germany 5-1 in the first round. The Serb will have to reach at least the final in Paris next week if he's to qualify for the eight-man ATP World Tour Finals in London.
