By Tom Gott Chelsea have returned from their first pre-season tour of the Enzo Maresca era, and it’s safe to say it was an… interesting few weeks. After a scrappy draw with Wrexham, Chelsea were thumped by both Celtic and Manchester City and also fell to defeat against Real Madrid, with a 3-0 win over Club America the only morale booster in what was a difficult introduction to Maresca-ball. Here are five things we learned from Chelsea’s time in the States. 1. Enzo Maresca’s high risk systemMaresca has already admitted Chelsea are going to concede goals because of the risks associated with hi…