If you enjoy huge upsets, then this past weekend was a great time to be a college softball fan. The top three teams in the country all went down, setting the table for an interesting second weekend of the Mary Nutter Classic in Palm Springs, California. 

Watch the 2018 Mary Nutter Collegiate Classic LIVE on FloSoftball

Strap in softball fans, the 2018 season is getting weird.

Here were the top highlights from the second week of NCAA action:

Boston University stuns #1 Oklahoma at the Troy Cox Classic

Boston University lost two out of its three contests this weekend at the Troy Cox Classic in Las Cruces, New Mexico, but the Terriers' lone victory was sure a big one. After chasing Oklahoma starter Mariah Lopez in the second inning, BU held on for a 4-3 victory on Saturday against the top team in the country, the Terriers' first win against OU since 1993.

BU plated two runs in the top of the sixth, helped in part by two errors by the Sooners, and Terriers reliever Lizzie Annerino shut things down from there. She pitched four and two-thirds of shutout ball to lock down the best team in the country.

The final out‼️ #ProudToBU #BUSB pic.twitter.com/xuxlTYHXVD

— BU Softball (@TerrierSoftball) February 17, 2018

#18 Louisiana topples #2 Florida with epic walk-off homer in the 11th

The second-ranked Gators shut out the host Ragin' Cajuns through the first two games of their series in Lafayette, Louisiana, 4-0 and 9-0, but Louisiana would get its revenge in the finale on Sunday. And it was some epic, extra-innings revenge at that. Freshman outfielder Casidy Chaumont delivered the goods in the bottom of the 11th, uncorking a two-run, walk-off shot off UF's Aleshia Ocasio that sailed over the left-center fence to give Louisiana a 4-3 win. Madness ensued.

Cajuns capture final game of Top 25 showcase at Lamson Park in walk-off fashion. Ellyson pitched 11 strong innings and Chaumont provided the heroics. #GeauxCajuns

?https://t.co/VJmbNBgqjo pic.twitter.com/zBHMOTuYiF

— Ragin' Cajuns SB (@RaginCajunsSB) February 18, 2018

Chaumont played hero in this one, but if she was the Batman of this game then Louisiana sophomore starter Summer Ellyson was most certainly the Robin. She went all 11 innings in the circle for the Cajuns, allowing only three runs despite walking six batters and giving up eight hits.

Another top five upset! #3 Oregon falls to #23 Ole Miss

With No. 1 OU, No. 2 Florida, No. 3 Oregon each losing, it's first time since 2010 that the top three softball teams after Week 1 all lost in Week 2.

— Graham Hays (@grahamhays) February 18, 2018

It was a bumpy weekend for the top two teams in the country, and Oregon joined the trend by dropping a nine-inning contest to Ole Miss on Saturday at the Puerto Vallarta College Challenge. Ducks starter Megan Kleist pitched an absolute gem, striking out 16 and walking none in 8 1/3 innings of work, but nonetheless, she took the loss as Ole Miss leadoff hitter Elantra Cox hit a walk-off single in the bottom of the ninth for a 1-0 victory.

We will just leave this here... @ElantraCox for the win in the bottom of the 9th ? #OMG #HottyToddy @OleMissSoftball pic.twitter.com/YlIW4KUf3Q

— OMSP (@OleMissVideo) February 18, 2018

Stanford LF Lauren Frost sacrifices life and limb for sick catch in foul territory

The Cardinal ended their weekend against Army with a no-hitter from Kiana Pancino, but our vote for the Stanford highlight of the weekend goes to Lauren Frost for this ridiculous grab in left.

One hell of a catch!

That’s how you get it done. @StanfordSball pic.twitter.com/VG991nvkST

— FloSoftball (@FloSoftball) February 17, 2018

Thrilling upset for Arkansas over #21 Utah

It wasn’t quite of the top five variety, but the Razorbacks' 4-2 win over the No. 21 Utes at the Mary Nutter Classic on Saturday was still a big one. Arkansas center fielder Loren Krzysko had a huge day at the plate, including a solo shot in the first and a two-run single in the seventh to give the Hogs the lead for good.

?UPSET ALERT?
Arkansas takes down No. 21 Utah! pic.twitter.com/OXCht3JpJv

— FloSoftball (@FloSoftball) February 18, 2018

Utah has had a tough start to its season, as the Utes currently sit 3-4, but they’ve played a difficult schedule for sure with three of their four losses coming against ranked opponents.

Alexa Romero throws second perfect game in Syracuse history

Not since the start of the 21st century has Syracuse recorded a perfect game, but that changed on Saturday as sophomore lefty Alexa Romero shut down Sacramento State in an 8-0 win at Mary Nutter. Romero struck out nine on the evening and moved to 3-0 for the season.

Alexa Romero tosses the second perfect game in program history to lead the Orange to and 8-0 win over Sacramento State ? pic.twitter.com/uKpzzRww95

— Syracuse Softball (@CuseSB) February 18, 2018

It was the Orange’s first perfect game since Tara DiMaggio tossed the first in school history on April 25, 2000.

#5 Washington goes eight straight games without allowing a run

The Huskies mercifully allowed a single run in their 13-1 blowout win over Sam Houston State on Sunday in Huntsville, Texas, but entering that contest fifth-ranked Washington had gone nine days and eight games without surrendering so much as a run. That ridiculous streak — a UW school record — occurred while the Huskies' hitters outscored their competition 88-0. That’s some good softball.

That'll do it! The Huskies set a new program record for consecutive shutouts with their 7th, winning 10-0! #GoHuskies pic.twitter.com/QC9nfEvqVR

— UW Softball (@UWSoftball) February 17, 2018

The 10-0 Washington ladies will play three more games in Texas versus unranked opponents this week before heading west for Mary Nutter — LIVE on Flo — this weekend.

By Lincoln Shyrack