Spieth and Walker share lead
Jordan Spieth, last year's US PGA Tour Rookie of the Year, and fellow American Jimmy Walker share the lead after the first two rounds of the Pebble Beach National Pro-Am.
Spieth (right) fired a four-under 67 at the Monterey Peninsula course while Walker shot a three-under 69 at Spyglass Hill to leave both on nine under, even though Spieth was on 134 and Walker on 135.
The US$6.6 million ($8.4m) event features players on three different courses over the first three days before the finish at Pebble Beach.
This creates the odd situation where players are level under par despite different total-stroke scores.
American Hunter Mahan fired a 68 at Spyglass to seize second on eight under.
Rookie Andrew Loupe, the first-round leader, fell to fourth at seven under following a one-over 73 at Pebble Beach, one shot in front of US countryman Richard Lee.