How many golfers make the cut at The Open Championship? Here's what to know about the cut line rules for the British Open.

Rory McIlroy shot 1-under 70 in the first round of the British Open at Royal Portrush that is also serving as a homecoming for the Northern Irish star.

The "Golden Bear" and 18-time major winner won the first of his three Opens and completed the first of his three career grand slams along the southeastern Scottish coast in 1966, then called the par-71 layout "the best golf course in Britain."