Bethanie Mattek-Sands may have hit a 131 MPH ace on Friday at the Miami Open during her upset of No.9-seeded Elina Svitolina.

Then again, maybe not.

The radar gun showed 131, which is why Mattek-Sands, who was celebrating her 32nd birthday, was all smiles, but the WTA later said that the serve speed wasn’t official due to interference. Reportedly Mattek-Sands averaged first-serve speeds of between 110 and 115 for most of the match, so the WTA is likely correct.

If Mattek-Sands had been deemed official, it would have been tied for the fastest serve in WTA history. Per WTATennis.com, here are the ten fastest recorded serves.

1. Sabine Lisicki - 131.0mph / 210.8kph (2014 Stanford)
2. Venus Williams - 129.0mph / 207.6kph (2007 US Open)
3. Serena Williams - 128.6mph / 207.0kph (2013 Australian Open)
4. Julia Goerges - 126.1mph / 203.0kph (2012 French Open)
5. Brenda Schultz-McCarthy - 126.0mph / 202.7kph (2007 Indian Wells)
6. Nadiia Kichenok - 125.5mph / 202.0kph (2014 Australian Open)
7T. Lucie Hradecka - 125.0mph / 201.2kph (2015 Wimbledon)
7T. Naomi Osaka - 125.0mph / 201.2kph (2016 US Open)
9. Anna-Lena Groenefeld - 125.0mph / 201.1kph (2009 Indian Wells)
10T. Ana Ivanovic - 124.9mph / 201.0kph (2007 French Open)
10T. Denisa Allertova - 124.9mph / 201.0kph (2015 Australian Open)