Keylor Navas immediately showed his class on his Nottingham Forest debut as he helped his new club to a 1-0 win over Leeds in a crunch match at the bottom of the Premier League.The three-time Champions League winner with Real Madrid was part of Forest's recruitment drive in January, making a loan switch from Paris Saint-Germain, and he produced a string of saves in the first half to keep Leeds at bay.He had already saved from Luis Sinisterra by the time Brennan Johnson's 14th-minute goal put Forest ahead and then he kept out Luke Ayling and Willy Gnonto to ensure the three points.The win is massive for Forest in their bid to move clear of the bottom three and they are now six points above 18th-placed Everton and may now begin to look up rather than down after strengthening their squad last month.Leeds are definitely looking over their shoulders as after a seventh game without a win they are out of the bottom three on goal difference alone, with two games against Manchester United coming up in the next seven days.They will live to regret coming up against Navas in this form as they squandered good chances in the first half, but could not find that cutting edge in the second half.Forest enjoyed a busy end to the transfer window as they added three signings on deadline day and brought in Andre Ayew as a free agent two days later.Highly decorated goalkeeper Navas was the only starter of those and immediately proved his calibre as he was forced into an early save.Sinisterra darted into the penalty and flicked an effort towards goal but the former Real Madrid man got down well to keep it out.Forest took a while to get going but once they did they soon went ahead.Morgan Gibbs-White sent in a free-kick from the right which went