The ATP Challenger events typically attact players with a World Ranking between 80 and 200.
This level of competition features many of the worlds up and coming players who are looking to progress to compete on the main ATP and WTA Tours.
You can watch these events at the Dan Maskell Tennis Centre on Loughborough University Campus in November. (Men's events 6 - 13th, women's events, 7 - 13th)
More information