Results from the third day of the ATP Finals at London's O2 Arena on Tuesday (x denotes seeding): Singles Group London 2020 Dominic Thiem (AUT x3) bt Rafael Nadal (ESP x2) 7-6 (9/7), 7-6 (7/4) Playing later Stefanos Tsitsipas (GRE x6) Andrey Rublev (RUS x7) Doubles Group Mike Bryan Kevin Krawietz/Andreas Mies (GER/GER x3) bt Lukasz Kubot/Marcelo Melo (POL/BRA x8) 6-2, 7-6 (7/5) Playing later Rajeev Ram/Joe Salisbury (USA/GBR x2) v Wesley Koolhof/Nikola Mektic (NED/CRO x5) afp