Rafael Nadal reached the ATP Finals last four by beating 2019 champion Stefanos Tsitsipas in three sets, reports BBC. The Spanish world number two overcame Greek Tsitsipas 6-4 4-6 6-2 in London. Nadal, 34, had been the more consistent player until losing serve to drop the second set, but fought back to dominate the decider. The 20-time Grand Slam champion will play Russian Daniil Medvedev in the semi-finals at the O2 Arena on Saturday. Medvedev is already guaranteed to win Group Tokyo 1970.