Tiger Woods misses the cut on dramatic second day at US Open

Former champion Tiger Woods has failed to make the cut on a dramatic second day at the US Open.

The ex-world No.1 shot a second round six-over 76, leaving his score a huge 16 over par.

There was further drama at Chambers Bay though when Australian Jason Day collapsed on the ninth tee, after suffering from vertigo.

The world number 10 was quickly attended to by paramedics and his caddie and mentor Col Swatton and was heard to say that the incident was related to "vertigo I've had for a while".

After several minutes the 27-year-old was able to get unsteadily to his feet and complete the hole, although he was unable to get up and down from a greenside bunker and had to settle for a round of 70 to finish two under par.

Masters champion Jordan Spieth kept his bid to make history firmly on track though.

The American is looking to become only the sixth man, after Craig Wood, Ben Hogan, Arnold Palmer, Jack Nicklaus and Woods, to win the Masters and US Open in the same year.

The world number two can also become the first player since Gene Sarazen in 1922 to win multiple majors aged 21 or younger at Chambers Bay and set a clubhouse target of five under par that only Ryder Cup partner Patrick Reed was able to match.

Reed and Dustin Johnson both reached seven under par before dropping shots in the tougher afternoon conditions, with Johnson carding three bogeys in his last five holes to finish four under par alongside South African Branden Grace.

Starting on the back nine, Spieth birdied the 10th, 14th, 15th and 17th - he also three-putted the driveable 12th for par after missing from two feet - before running up a double-bogey six on the par-four 18th, which played as a par five in the first round and par four in the second.

Second round scores

-5 J Spieth (US), P Reed (US)

-4 B Grace (SA), D Johnson (US);

-3 J Luiten (Ned), T Finau (US), D Summerhays (US), B Martin (US)

Selected others:

-2 J Day (Aus);

-1 S Lowry (Ire), H Stenson (Swe);

+1 P casey (Eng);

+2 L Westwood (Eng), J Rose (Eng), M Warren (Sco);

+3 P Mickelson (US);

+4 L Donald (Eng), R McIlroy (NI);

+5 I Poulter (Eng), J Gunn (Sco), C Montgomerie (Sco)