Retief Goosen and Vijay Singh, among the top five players in the world a decade ago, were part of a five-way tie for the lead in the Northern Trust Open in what amounted to ''throwback Thursday'' at Riviera. The 51-year-old Singh, who plays the occasional Champions Tour event, picked up four birdies on the back nine for a 5-under 66, his lowest opening round on the PGA Tour since the 2012 McGladrey Classic.
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