Spieth shoots 64, leads by four in Hyundai Tournament of Champions

After shooting a 9-under 64 in the second round of the Hyundai Tournament of Champions, world No. 1 Jordan Spieth took the lead on the Plantation Course at Kapalua. He stands at 16-under, four strokes clear of the field.

Spieth went out in five-under par, and all told had seven birdies and an eagle. He hit 17 of 18 greens in regulation, just as he did during the first round.

Spieth's playing partner, Patrick Reed, the first-round leader, shot 4-under, giving him a 36-hole score of 12-under and placing him tied for second with Fabian Gomez and Kevin Kisner. Spieth and Reed are the only two players not to have recorded a bogey over the first two rounds.

Spieth cited the chemistry that he and Reed have when paired together for his stellar play in part.

"For whatever reason it is, whether we want to feed off each other or we want to beat the crap out of each other, we somehow play well together," Spieth said following the first round. "We still want to out do each other even when we're teammates in a Ryder Cup or Presidents Cup. So it's a good pairing."

Kisner moved five spots up the leaderboard by posting an 8-under 65.

Rickie Fowler, whose breakthrough 2015 featured a win in the Players, had six birdies in a round of 67 to get to 10-under and tied for sixth.

Others remaining within striking distance include Danny Lee (11-under, fifth), Steven Bowditch (10-under, tied for sixth) and Bubba Watson (9-under, tied for eighth).

Jason Day, meanwhile, remains well off the pace at 3-under and tied for 21st.