As is always the case, the weekend at the U.S. Women’s Open got serious. There is a special pressure in this championship that can’t be practiced, only learned through experience. After Friday’s second round, 19 players were under par at Champions Golf Club. Going into Sunday’s Round 4, only four are in red figures.

The difference is not so much that the course is set up to be more difficult as it is that the competitors more intensely feel the challenge of taking on the best players in the world for one of the game’s biggest prizes. In the final round, it will be even more intense.

Here are 3 things to look for in Sunday’s final round.

How Far Back?

Hinako Shibuno had a chance to separate herself from the pack with an under-par round on Saturday, but a 74 has her at 4-under-par 209 through 54 holes, one stroke ahead of Amy Olson. So how far back should we be looking for those who could catch the 22-year-old star from Japan?

There are some names poised in a threatening position if there is a stumble at the top of the leader board. Lurking at 1-over-par 214 – five strokes behind Shibuno, are Rolex Rankings No. 1 Jin Young Ko, this year’s Women’s PGA winner Sei Young Kim, 2018 U.S. Women’s Open champion Ariya Jutanugarn and 2007 winner Cristie Kerr. Among the group at 2-over 215 is defending champion Jeongeun Lee6.

All they can do is play their game – and hope the leaders open the door. This is the U.S. Women’s Open. Pressure can make that happen.

Zeroes Add Up

Safe to say 2020 is a year no one will forget. Sunday could make it memorable in a good way. Shibuno could win in her first try at the U.S Women’s Open; Amy Olson could be on that short list of players whose first LPGA win was the U.S. Women’s Open; and Moriya Jutanugarn could join her sister Ariya with the trophy, making them only the third pair of sisters to both win USGA titles.

After all, years ending in zero have been magical in this championship. Ten years ago, Paula Creamer won at Oakmont with a sizzling final six holes. In 2000, Karrie Webb won and backed up that title in 2001, making her the last champion to successfully defend. Betsy King won in 1990, defending the title she won a year earlier.

Amy Alcott took the championship in 1980 and Donna Caponi successfully defended in 1970. Betsy Rawls won for a fourth and final time – a record later tied by Mickey Wright – in 1960. And in 1950, Babe Zaharias won the second of her three U.S. Women’s Open titles. Years ending in zero never come up empty in the U.S. Women’s Open.

Weather, or Not

Things worked out on Friday when bad weather was predicted and tee times were moved up. The storms came in after play was finished. Hopefully, that will be the case for Sunday’s final round. The first tee time was moved up to 7:45 CST and Golf Channel altered its coverage to come on at 10 a.m. EST until 2 p.m., when it will hand off the baton to NBC.

So far, every move at this U.S. Women’s Open has been perfect, especially considering the challenging conditions under which it has been conducted. Now it needs one more day of things falling perfectly into place.

Ron Sirak is a Massachusetts-based freelance writer who frequently contributes to USGA digital channels.