Austrian tennis player Dominic Thiem, led by Chilean Nicolas Massú, debuted with a triumph on Sunday at the ATP Finals, which is played at the O2 in London, after beating Swiss Roger Federer by a 7-5 double. in Athens 2004 he accompanied Serbian Novak Djokovic as first winners of the Bjorn Borg Group, after surprising a Federer who skipped the Masters 1,000 in Paris to get fresh to London but failed to make his best version. Thiem, who added his third win in 2019 over the Swiss and a 2-5 in direct matches, took control of the match from the start. The Austrian broke the 20’big’ champion’s take in the first game and then Federer had to find solutions. The intensity also cost unforced errors to a Thiem who lost the lead in the fourth game, but returned to the charge to break again and take the set. In a second equal ized, Federer neglected his comeback in a decisive game. Thiem signed up for the break to win, which tried to unsuccessfully delay that of Basel, a six-time masters’ champion. This Monday will be the premiere of Spaniard Rafael Nadal, conditioned until the end by his pains in the abdominal area, when he faces German Alexander Zverev in the first day of the Andre Agassi Group. The other meeting will be played by Russian Daniil Medvedev and Greek Stefanos Tsitsipas.