Portugal Masters: Andy Sullivan hits 10 birdies to grab a share of the lead
|Portugal Masters second round|
|-14 M Warren (Sco), A Sullivan (Eng); -13 P Harrington (Ire), J Fahrbring (Swe); -12 D Lipsky (US)|
|Selected others: -11 P Waring (Eng), -10 C Shinkwin (Eng), R Ramsay (Sco), P Lawrie (Sco), -8 A Noren (Swe)|
Defending champion Andy Sullivan carded a 10-under-par 61 to share the halfway lead with Marc Warren after round two of the Portugal Masters on Friday.
Englishman Sullivan, who won the event by a record nine shots in 2015, had 10 birdies in a season-low round to end the second day on 14 under.
Scotland's overnight leader Warren hit a 65 to follow his opening 63.
Ireland's Padraig Harrington shot 63 and is tied for third on 13 under par with Sweden's Jens Fahrbring.
Sullivan, the world number 53, who played in Europe's Ryder Cup defeat by the United States, said he "had thoughts of 59 coming down the stretch".
He added: "I knew I needed to go low to get a beat on the leaders. So to go out there and shoot that score is absolutely fantastic."
On a day of low scoring, Scotland's Richie Ramsay matched Sullivan's 61, moving up to a share of 10th place on 10 under, along with compatriot Paul Lawrie.