REUTERS: Three-time Grand Slam champion Stan Wawrinka and this year's U.S. Open runner-up Daniil Medvedev will both take part in the inaugural Diriyah Tennis Cup in Saudi Arabia in December.
The three-day event starting on Dec.12, featuring a US$3 million prize pot, will take place on the outskirts of Riyadh.
It is not part of the ATP Tour and therefore will not feature ranking points.
Italian Fabio Fognini and Belgium's David Goffin are also involved with four other players to be announced in the coming weeks, organisers said on Tuesday.
(Reporting by Martyn Herman; Editing by Christian Radnedge)