Inter Milan coach Antonio Conte admits they beat Brescia by sheer "determination".
Martinez and Romelu Lukaku struck for the 2-1 win.
“It becomes difficult to talk about the game, because the same players are out there constantly. They struggled to an extraordinary degree," Conte told Sky Sport Italia.
“It was our fourth game in nine days, with the same players. Any situation or result is acceptable at that point. All we can do is thank them for the spirit they showed to hang in until the end.
“Now we're only halfway there, as we have another game with Bologna, then Borussia Dortmund and we'll have seven games in 20 days before we get to rest. It's an anomaly and I haven't seen any other side with a fixture list like that, so it seemed very strange to me.
“Some games you need to win just by suffering. They must understand that for many reasons, as for example the hosts are pushing to turn the result around, you have to soak up the pressure, hang in there and I challenge anyone to play four games in nine days while getting a victory at Brescia.
“I'll take it. I thanked the lads. Inevitably, I'd like more time to prepare matches, especially as we had to change our plans today because Brescia played with practically five at the back and adjusted everything.
“Eugenio Corini did well last season to win the Serie B title, he's a great coach and was my teammate at Juve, so I know he's also a wonderful guy."