By Peter Mwaura
Defending ATP finals champion Alexander Zverev reigned supreme over Russian 4th seed Medvedev to secure the remaining semifinal spot in London .his win knocking out world number one Rafael Nadal whose win over Stefanos Tsitsipas was not enough to propel him to the semis.
Roger Federer is scheduled to play Tsitsipas of Greek in the semis as Zverev play Dominic Thiem in the other semifinal.