The Wokingham ace has been in superb form in recent months, winning a number of doubles titles with partner Lewis Burton and also claiming a couple of singles trophies along the way.
The latest triumph came at the GB F22 Futures event in Tipton last week where Willis and Burton where their fifth doubles title in their last seven outings.
The duo came through a tough semi-final against Neil Pauffley and George Morgan - a junior Wimbledon doubles champion - by a 6-3, 6-2 scoreline.
The final against University of Stirling pair Graeme Dyce and Calum Gee proved to be a keenly-contested affair with Willis and Burton edging a first set tie-break 7-6 and then dominating the second set to win 6-2 .
Willis, who, at the time the News went to press, was competing at the GB F23 Futures in Edgbaston, is now on course to break the record of most Futures titles won in a year by a British player.
His 10 wins this season (three singles and seven doubles) means he is just one behind former GB number Josh Goodall.
And Willis will be hoping he can go on to even bigger and better things next year with a new coaching team behind him.
The A1 Pharmaceuticals-sponsored player has hired former professional Matt Smith as head coach and Chris Daw as his assistant.
He will now be based at Surbiton Performance Academy in Surrey and will have his fitness and conditioning provided by expert Ricky Ingram, who has worked with a number of England rugby union players in the past.
Speaking about the developments, Willis said: “Gary (Lewis, manager) and myself have recently appointed two new specialist coaches that will be working with both myself and Lewis throughout 2014.
“With A1 Pharmaceuticals as a sponsor and managing a well-balanced support team Lewis and myself can now fully focus on our training and winning tennis matches.”
Lewis added: “Marcus and Lewis are natural team players and exhibited an obvious chemistry and synergy from the onset.
“The future is bright for this exciting all GB doubles pairing which will be funded by A1 Pharmaceuticals.”