General :: Escape Characters In Watch Command

Need little advice running this command.
watch -d 'ps aux | awk '{print $4" "$11}' | sort | uniq -c | awk '{print $2" "$1" "$3}' | sort -nr | head'

I get this error message from AWK. awk: cmd. line:1:
{print awk: cmd. line:1: ^ unexpected newline or end of string

I have tried all the usual by trying to escape the single and double quotes in the command but same result. The end result should be the a listing of memory hungry processes that are scanned every 2 seconds (watch default value).