The Pata Yamaha rider set a blistering time of 1:38.597s which was just under a tenth clear of the reigning WorldSBK champion.
Looking to reclaim the title following Bautista’s dominant showing in 2022, Razgatlioglu completed a total of 60 laps ahead of today’s second and final day.
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Razgatlioglu, who remains in contention to move to MotoGP following this season regardless of if he wins the Superbike title or not, was just a few tenths shy of the lap record, which he’s aiming to beat.
"I enjoyed today after a long time and I’m riding my bike again," Razgatlioglu told WorldSBK.com. "There was very good working [from the team] because we tried many new parts.
"Finally we are making big improvements because I remember in 2020, the winter test in Jerez, my best time with the race tyres was 38.8s but today I see 38.5s.
"This is good improvement because 38s is a very fast lap time. I'm going to try for a 37s; okay it’s not easy this lap time but I say why not."
Razgatlioglu also detailed what changes have been made to his R1 as Yamaha look to provide him with a machine that can fight Bautista more regularly on the straights.
The Turkish star added: "We tried new electronics and worked on acceleration. I’m feeling much better now. We used the old bike and the new bike and I felt really good improving. It’s a good step for the new season."
Bautista finds improvements with new Panigale V4 R ahead of WorldSBK title defence
What was a busy day for Razgatlioglu was also true for Bautista, with the Spaniard testing both the 2022 and brand new 2023 Panigale V4 R bikes.
Content with his opening day, Bautista said the engine from the 2023 model was smoother and more linear than its predecessor.
"In the morning I compared the 2022 bike to the new one to see the biggest difference and basically I don’t really feel a big difference between both bikes," said Bautista.
"But the new one, especially with the engine, it seems like the engine is more linear and more gentle, more smooth, so I think I found just an advantage with the new engine, the new bike."
While it was a strong day in terms of performance for Bautista, the Ducati rider did suffer a crash at turn one which was as a result of rapidly closing in on Moto3 rider Ana Carrasco, who was taking part in a track day.
Bautista added: "I had a small crash in turn one because - I think I had [Ana] Carrasco in front of me but she was like too far [ahead] and when I started to brake I caught her very quickly and had to pick up the bike.
"I went to the dirty area and I lost the front. It was a very soft crash and fortunately it didn't have any consequences."