Making the most of a recent private Yamaha test, Jorge Lorenzo began the Brno MotoGP weekend in perfect fashion by leading morning practice from start-to-finish.
The Spanish star then picked up where he left off in the afternoon session.
However his lap time progress stalled after lap four and Lorenzo was eventually pipped to the top spot by LCR Honda's Stefan Bradl in the closing minutes.
“I started in a very good way in the morning and also in the beginning of the second practice,” confirmed Lorenzo, just 0.038s behind Bradl.
“Then we started to try some things on the bike that weren't as good as we expected.
“We spent all the practice trying things so I wasn't very fast at the end of the session. Anyway, the positive thing is tomorrow we have a clear direction, so we can go more quickly to a better lap time.
“We can improve on braking, and the smoothness of the bike at the beginning of the corner.”
Despite the afternoon issues, Lorenzo posted more sub 1min 57s laps than any other rider.
Lorenzo starts this weekend third in the championship and 35 points behind rookie title leader Marc Marquez, who was fifth in Friday practice. Lorenzo's team-mate Valentino Rossi, also at the private test, set the fourth quickest lap time.