It was a day of upsets in the ATP Finals as top 2 ranked players in the world, Novak Djokovic and Rafael Nadal were knocked out in their respective semi-final games on Saturday. Djokovic went down in a nail biting 3-setter against Dominic Thiem as the Austrian's 300th career win powered him to his 2nd consecutive final at the ATP Finals. The tournament will see a first time champion this time around as Thiem will take on Daniil Medvedev in the final showdown. The 24-year-old Russian stunned Nadal in 3 sets to record his first-ever victory over the Spaniard and ended his 71-match winning streak. Twice a runner-up in 2010 and 2013, Nadal's wait to get his hands on the ATP Finals trophy continue.