head-to-head

At a combined age of 99, two of snooker's all-time greats go head-to-head on Tuesday as John Higgins takes on Mark Williams with a place in the World Championship semi-finals up for grabs.

There is a long way to go until Swiatek enters the conversation of being on the receiving end of the most dominant head-to-head record.

O'Sullivan, who has claimed a record 41 ranking titles, has dominated their head-to-head statistics, winning 24 of their 27 matches in varying formats of the game.

Zuckerberg has gone head-to-head with both the FTC and lawmakers in the past.

Experts previously found head-to-head contact was one of the primary causes of sports related concussion.