Crowded Leaderboard on the PGA and LPGA Tour.

MEXICO CITY (AP) — The second round has begun at the WGC Mexico Championship.

Veterans Phil Mickelson and Lee Westwood started the day in a six-way tie for the lead after firing 4-under 67s. PGA champion Jimmy Walker, Torrey Pines winner Jon Rahm, Ryan Moore and Ross Fisher also owned a share of first when players teed off this morning.

Just one shot back was Rory McIlroy, who will climb to the top of the world rankings with a victory in Mexico City. Current No. 1 Dustin Johnson opened with a 71 in his first round since climbing to the top of the rankings.

LPGA-SINGAPORE

Inbee Park takes 1-stroke halfway lead

SINGAPORE (AP) — Inbee Park made a birdie on the last hole to take a one-stroke lead over Michelle Wie and two others after two rounds of the LPGA's Women's Champions tournament.

Park lost her place atop the leaderboard when she made a double-bogey on the 12th hole, her only blemish in two rounds at the Sentosa Golf Club, but regained her composure with birdies on the 14th and 18th holes.

The Olympic gold medalist had a second consecutive five-under-par 67 to lead the $1.5 million event at 10-under 134.

Wie, who led overnight after an opening round of 66, shot a bogey-free 69 to join Hur Mi-Jung and Ariya Jutanugarn in a three-way tie for second.

Suzann Pettersen and Park Sung-Hyun reached the halfway stage at 8 under, tied for fifth. Six others, including No.1-ranked Lydia Ko, trail Park by three strokes and are tied for seventh.