Willis is up for the Challenger at Boat Club tournament
The duo will be joined in the £1,000 Knight Rennie-sponsored tournament by Leamington Tennis Club’s Miguel Espada.
Espada made it through to the main draw after overcoming Richard Whitwell in pre-qualifying.
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Hide AdRugby’s Jamie Taylor earned the other qualifying spot after getting past Warwick Boat Club’s Gavin Henderson.
Simon Dickson, who beat Roger Federer as a junior, emerging teenager Mason Recci and Coventry League players Cameron Malik and Andy Norton complete the line-up.
Play gets under way tomorrow at 1pm and entrance is free.