Look into diabetic shoes; they tend to have wide toeboxes. Luckily here in Las Vegas we still have an old fashioned, competent shoe store where they actually measure your foot (pressure pad and all), understand foot anatomy and how different manufacturers make their products. They recommended a few different brands. I prefer New Balance so they produced the 1540. The v2 fit me better but alas, all you can find now is the 1540v3. It wasn't the cheapest shoe, however it is leaps and bounds better than any other tennis shoe I have ever worn. Worth every penny.
FYI Vegas store for those interested: https://www.yelp.com/biz/cesars-shoe-world-las-vegas-3