Lewis Young bagged a stoppage-time winner as in-form Crawley beat Chesterfield 2-1.Louis Reed had given the hosts a first-half lead before the impressive Karlan Ahearne-Grant levelled on his Red Devils debut.The visitors have now won six of their last seven games while the Spireites slip back into the relegation zone. Ahearne-Grant made his intentions clear in the first minute with a powerful run and shot but it was the Spireites who took the lead in the 18th minute.A corner was partially cleared and Reed anticipated well before firing in low from 25 yards.Crawley looked to level before the break, Mark Connolly having an effort cleared off the line, Josh Yorwerth heading wide and Ahearne-Grant forcing two good saves from Aaron Ramsdale. The second half started at a high-tempo and both keepers made good saves before Ahearne-Grant picked his way through a hesitant defence to level the scores. The two sides shared half chances in the final half-hour before Young dramatically won the game in added time, the full-back firing home after some poor defending from Chesterfield.