p>Despite riding with an injured shoulder, Jorge Lorenzo was the one to beat in Japan on Friday as he set the pace in both practice sessions.
Having topped FP1 with a 1:45.432, the championship contender was quickly up to speed in the afternoon's session.
Laying down the laps he lowered his benchmark time to a 1:45.426 while Marc Marquez slotted into second place. The Honda rider was 0.103s slower.
Pushing hard Marquez was forced into an impressive save as he almost it through the swooping right-hander and had to raise his leg high into the air to regain his balance.
As their rivals battled it out behind them, Lorenzo and Marquez held the 1-2 through to the final five minutes of practice.
Bradley Smith come to the fore however his reign was brief as first Andrea Dovizioso and then Lorenzo edged ahead.
The Yamaha rider finished the day with a 1:44.731 while a late burst from Dani Pedrosa put the Honda rider up into second place, 0.128s off the pace.
Ducati riders Iannone and Dovizioso were third and fourth on board their GP15s while Smith and Aleix Espargaro were next in line.
Marquez dropped to seventh as he was unable to improve on his earlier time while Valentino Rossi finished P8. He was 0.823s behind his team-mate and championship rival.
There were falls for Loris Baz, who went down at Turn 11, and wildcard rider Katsuyuki Nakasuga.
1 Jorge LORENZO SPA Movistar Yamaha MotoGP 1'44.731
2 Dani PEDROSA SPA Repsol Honda Team 1'44.859 0.128
3 Andrea IANNONE ITA Ducati Team 1'45.043 0.312 4
4 Andrea DOVIZIOSO ITA Ducati Team 1'45.059 0.328
5 Bradley SMITH GBR Monster Yamaha Tech 3 1'45.250 0.519
6 Aleix ESPARGARO SPA Team SUZUKI ECSTAR 1'45.348 0.617
7 Marc MARQUEZ SPA Repsol Honda Team 1'45.492 0.761
8 Valentino ROSSI ITA Movistar Yamaha MotoGP 1'45.554 0.823
9 Pol ESPARGARO SPA Monster Yamaha Tech 3 1'45.597 0.866
10 Hector BARBERA SPA Avintia Racing 1'45.645 0.914
11 Cal CRUTCHLOW GBR LCR Honda 1'45.846 1.115
12 Scott REDDING GBR EG 0,0 Marc VDS 1'46.074 1.343
13 Maverick VIÑALES SPA Team SUZUKI ECSTAR 1'46.464 1.733
14 Jack MILLER AUS LCR Honda 1'46.477 1.746
15 Yonny HERNANDEZ COL Octo Pramac Racing 1'46.563 1.832
16 Danilo PETRUCCI ITA Octo Pramac Racing 1'46.648 1.917
17 Stefan BRADL GER Aprilia Racing Team Gresini 1'46.649 1.918
18 Takumi TAKAHASHI JPN Team HRC with Nissin 1'46.650 1.919
19 Eugene LAVERTY IRL Aspar MotoGP Team 1'46.770 2.039
20 Nicky HAYDEN USA Aspar MotoGP Team 1'46.827 2.096
21 Mike DI MEGLIO FRA Avintia Racing 1'46.934 2.203
22 Alvaro BAUTISTA SPA Aprilia Racing Team Gresini 1'46.974 2.243
23 Katsuyuki NAKASUGA JPN Yamaha Factory Racing Team 1'47.096 2.365
24 Loris BAZ FRA Forward Racing 1'47.219 2.488
25 Toni ELIAS SPA Forward Racing 1'47.689 2.958
26 Alex DE ANGELIS RSM E-Motion IodaRacing Team 1'48.572 3.841
27 Kousuke AKIYOSHI JPN AB Motoracing 1'48.769 4.038