Red Bull's Max Verstappen topped the timesheet of the first practice session of the Chinese Grand Prix marked by two lengthy red-flag periods and limited running.
The Dutchman got his timing right, achieving his best lap on intermediate tyres to end up 1.5s cleaf of Williams duo Felipe Massa and Lance Stroll.
The first red flag was initiated at the outset when adverse weather conditions prevented the medical helicopter from potentially flying.
When proceedings finally got underway after a 45-minute delay, rookie Lance Stroll went fastest on the still damp track before Verstappen took command.
Nico Hulkenberg's beached in the gravel trap at Turn 3 Renault brought out a virtual safety car, but when crews finally retrieved the Germans' car, weather once again grounded the helicopter.
In the end, with four minutes to go the session was called off, leaving neither the Mercedes or Ferrari drivers anywhere near the head of the field
Bottas succeeded in posting a timed lap but team mate Lewis Hamilton, and Sebastian Vettel and Kimi Raikkonen never accomplished a flying lap.
|1||Max Verstappen||Red Bull||1:50.491s||4|
|2||Felipe Massa||Williams||1:52.086s||+ 1.595s||7|
|3||Lance Stroll||Williams||1:52.507s||+ 2.016s||7|
|4||Carlos Sainz||Toro Rosso||1:52.840s||+ 2.349s||5|
|5||Romain Grosjean||Haas||1:53.039s||+ 2.548s||6|
|6||Daniil Kvyat||Toro Rosso||1:53.314s||+ 2.823s||4|
|7||Fernando Alonso||McLaren||1:53.520s||+ 3.029s||5|
|8||Daniel Ricciardo||Red Bull||1:54.038s||+ 3.547s||7|
|9||Valtteri Bottas||Mercedes||1:54.664s||+ 4.173s||4|
|10||Kevin Magnussen||Haas||1:55.104s||+ 4.613s||8|
|11||Nico Hülkenberg||Renault||1:55.608s||+ 5.117s||6|
|12||Stoffel Vandoorne||McLaren||1:57.445s||+ 6.954s||4|
|13||Marcus Ericsson||Sauber||2:15.138s||+ 24.647s||4|
|14||Antonio Giovinazzi||Sauber||2:15.281s||+ 24.790s||4|
|18||Esteban Ocon||Force India||2|
|19||Sergio Pérez||Force India||3|