The 23-year-old Surrey batsman, who was the son of former England international Matthew Maynard, died at Wimbeldon Park station, the scene of the accident.
British Transport Police (BTP) has confirmed the tragedy, which is classed as ‘non-suspicious’.
A BTP spokesman said: “BTP officers were called to the line near Wimbledon Park London Underground station on Monday, 18 June after a man was struck by a District line train.
“The incident was reported to BTP at 5.03am and was also attended by Metropolitan Police officers.
“London Ambulance Service medics attended but the man, believed to be 23 years old, was pronounced dead at the scene.
England were practising at Maynard’s home ground of the Kia Oval ahead of Tuesday’s second one-day international when the news began to emerge. The players are said to be in shock.
Former England cricketer Andrew ‘Freddy’ Flintoff took to Twitter to express his condolences, saying: “tragic news that a great lad , Tom Maynard is no longer with us . All my thoughts are with his family at this awful time x x”
Ex-England captain Michael Vaughan, said: “Thoughts are with Matt Maynard and his family.. Words can’t describe the Terribly sad news that Tom Maynard has died aged 23…#RIPTOM”
Maynard left Glamorgan last year to join Surrey and turned out for them last night for their Twenty20 contest with Kent in Beckenham.
Born in Cardiff, his style of play had been likened to that of Kevin Pietersen, and with his right-handed batting flair, plus right-arm off-break, he was widely tipped to play for England. He turned out for England Lions last winter.
However, only last week Maynard was disciplined by Surrey for being out late during a championship match against Sussex in Hosham. He returned to their side for the Twenty20 game at Beckenham against Kent on Sunday.
Surrey’s t20 game against the Hampshire Royals at the Oval that was scheduled for this Wednesday has now been postponed.
Surrey Chairman Richard Thompson said: “Our thoughts at this awful time are with Tom’s family and friends and all those that were close to him.
“Tom Maynard was a prodigiously talented young batsman who had made an incredible start to his career and was clearly destined for far greater things. The impact Tom made in such a short period of time for Surrey CCC spoke for itself. There is a profound sense of loss at the passing of Tom. To lose anybody at such a young age is an utterly senseless tragedy.”
ECB Chairman Giles Clarke said: “This is a very sad day for everyone connected with Surrey County Cricket club and for Glamorgan County Cricket club where Tom spent the early part of his career.
“Tom was a player of enormous potential who had already represented England Lions and had an exciting future ahead of him. Our hearts go out to the Maynard family for their tragic loss and we send them and all Tom’s many friends and colleagues within the game our deepest sympathies.”
It is a terrible tragedy for the game and a Surrey club who 10 years ago lost Ben Hollioake to a car accident in Australia.