Golf-Schwartzel rides lightning to Valspar victory (Reuters)

* Schwartzel makes up five-shot deficit

* Haas makes mess of playoff

* Spieth ties for 18th ahead of Masters defence (Adds quotes, details)

March 13 (Reuters) - Charl Schwartzel secured his first victory in the United States since the 2011 Masters by beating Bill Haas in a playoff at the Valspar Championship in Florida on Sunday.

South African Schwartzel came from five shots behind in the final round to card a four-under-par 67 before beating Haas with a tap-in par at the first extra hole.

While the win will boost Schwartzel's confidence going into next month's Masters, world number one Jordan Spieth has some work to do as he tunes up for his title defence at Augusta.

Spieth carded a 73 on Sunday…