Have you seen this article (by Richard Pagliaro of Tennis.com)
Foot Boost: A Training and Treatment Tool for Feet
"...Through scans we've found advanced players spend much more time on their toes than club players,
and some of those players we've scanned have played in running shoes because running shoes are designed to help you push off your toes"
"Think about the changes we've seen in racquets and strings and the slower surfaces and then ask yourself:
What changes have we seen in tennis sneaker technology during the same period?" Grossman says
Do any of you use running shoes as your primary footwear for tennis? Does it really help?