Maximum match point saved in a tennis match?

NOTE: This cannot be considered as a complete answer, since I wasn't able to find the record for WTA matches and also some sources I found contradict each other. But I am posting at least the information I was able to find, hoping that someone might be able to find the missing info.

Open Era records

ATP matches

Adriano Panatta saved 11 match points in his match against Kim Warwick in the first round of 1976 Italian Open. He won this match and then went on to win the tournament. Several sources confirm this as the Open Era record. 1 (1a), 2, 3. 4 (4a)

WTA matches

I found several mentions of Svetlana Kuznetsova defeating Virginia Ruano Pascual and saving 11 match points in Madrid 2001. 1. 2, 3.

I did not find any source confirming that this is indeed a record.

Grand Slam matches

In the open era there were 5 occurrences when a player saved 9 match points and won a match at a Grand Slam tournament.

• Most recently Nick Kyrgios defeated Richard Gasquet in the second round of 2014 Wimbledon Championships, saving 9 match points in the process.
• Vince Spadea saved 9 points in his first-round win at 2004 French Open where he won his match against Florent Serra.
• Christophe Roger-Vasselin saved 9 match points when he defeated Marcos Hocevar at 1982 French Open.
• Chanda Rubin saved 9 match points at 1995 French Open in her match against Jana Novotná. She was already falling behind 0–5, 0-40 in the third last set, yet she managed to win this match.
• Lucie Šafářová defeated Yanina Wickmayer in the first round of 2017 Australian Open after saving 9 match points.

Source: 1, 2, 3, 4, 5 (1a, 2a, 3a, 4a, 5a)

However, on some internet fora I found claims that Zsófia Gubacsi defeated Tamarine Tanasugarn in the first round of 2001 French Open after saving 11 match points. See: 1, 2, 3, 4 (1a, 2a, 3a, 4a).

So if this information is correct, grand slam record in women's GS matches can be as high as 11 match points. (Not the 9 match points Rubin's record as claimed in the above links.)

All time records

All time record seems to be Wilmer Allison's win against Giorgio De Stefani after saving 18 match points. This was in 1930 Davis Cup. Sources: 1 (1a), 2 (2a), 3, 4

Record in Grand Slam matches is 11 match points saved by Helga Schultze against Janine Lieffrig at 1966 Wimbledon. Sources: 1 (1a), 2 (2a)