US Open qualifying can be a mathematical migraine

This isn't necessarily the busiest time of the year for Jeff Hal - but it might be the most complicated.

Hall is the managing director of rules and competition for the USGA. As the final stage of qualifying for the US Open unfolds, his job is to crunch numbers to figure out how many spots to allocate on Monday to the 10 qualifying sites across America.

Two sectional qualifiers are done. The Japan qualifier last week was awarded four spots for 40 players. At the England qualifier, 13 players out of 95 qualified for Oakmont on June 16-19.