Highest scores by a second-round leader or leaders in Masters history:

144 Billy Joe Patton 1954

144 Craig Stadler, Curtis Strange 1982

143 Herman Keiser, Lloyd Mangrum 1949

143 Peter J. Butler, Paul Harney 1966

142 Horton Smith 1934

142 Brett Wetterich, Tim Clark 2007

The largest deficit ever made up over the final 36 holes:

Eight strokes, by Jack Burke in 1956. Burke was 1-under after two rounds, eight shots behind leader Ken Venturi.

Second-round leaders or co-leaders have gone on to win 27 times at the Masters. Recent 36-hole leaders who have won:

Seve Ballesteros 1980

Sandy Lyle 1988

Nick Faldo 1989

Tiger Woods 1997

Jose Maria Olazabal 1999

Mike Weir 2003

Best rounds of the day:

68 Paul Casey, Padraig Harrington

69 Jerry Kelly

70 Stuart Appleby, Bradley Dredge, Geoff Ogilvy

Brett Wetterich is only the eighth Masters rookie to hold or share the 36-hole lead. Others who have done it:

Horton Smith 1934

Lloyd Mangrum 1940

Billy Joe Patton 1954

Bert Yancey 1967

Mark Lye 1984

Jeff Maggert 1993

Chris DiMarco 2001

Big movers of the day:

- Padraig Harrington shot 68 to move from a tie for 59th to a tie for eighth.

- Paul Casey shot 68 to move from a tie for 75th to a tie for 15th.

The number of bogey-free rounds Friday: 0

There were four eagles made Friday:

Paul Casey No. 2

Luke Donald No. 2

Troy Matteson No. 2

Lucas Glover No. 15

There was only one birdie recorded on the par-3 fourth hole Friday, by amateur John Kelly.

Players who did not make a birdie this week: Steve Stricker, Bernhard Langer and amateur Richie Ramsay.