Most consecutive wins on grass courts as well as hard courts. Who holds this record?

Roger Federer holds the record for most consecutive wins on both grass courts (65 matches from 2003-2008) and hard courts (56 matches from 2005-2006). His dominance on grass included five consecutive Wimbledon titles from 2003-2007, while his hard-court streak included wins at the US Open, Australian Open, and various ATP Masters events. Nadal's consecutive win records are primarily on clay courts.