Mickelson leads at Riviera going into the weekend (AP)

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Ryan Palmer hits to the eight hole during the second round of the Northern Trust Open golf tournament at Riviera Country Club in Los Angeles, Friday, Feb. 17, 2012. (AP Photo/Chris Carlson)AP - Pat Perez hasn't gone up against Phil Mickelson since the opening round of the Match Play Championship four years ago.


Source: http://us.rd.yahoo.com/dailynews/rss/sports/*http%3A//news.yahoo.com/s/ap/20120218/ap_on_sp_go_su/glf_northern_trust_open

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