Matteo Berrettini came up short in his maiden ATP Masters 1000 final on Sunday but the Italian said his performances in Madrid have given him belief he deserves to be competing for top-level titles against the best players in men's tennis.
"I really worked hard to be here. Now that I'm here, I'm upset I lost," the world number nine told reporters.
"It's important for my tennis, for my level. Sascha won, not easily, but in two sets against Thiem and Rafa, and today (he) was struggling against me.
How can Norrie qualify for ATP Finals? Who else is in contention?
This is definitely a good feeling and something that I have to use, to build (on) in my next tournaments. It hurts now, but I know this loss is going to be useful.
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Berrettini said he had his chances against world number six Zverev and he was brimming with confidence going into this week's ATP Masters event in Rome and the French Open starting at the end of the month.
"I know and I feel that I can play this kind of tennis, this kind of level. I deserve to be here," he said.
"When I play and I use my weapons in the right way, all the players are struggling. This is something that makes me confident for the future.
"Once I'm healthy, I can reach my level, my best level. I think this week just showed that I can play this level. This was my first final. Hopefully it's not going to be my last."
Tsitsipas, Zverev stunned at Indian Wells as draw opens up for Norrie
Indian Wells order of play - Norrie, Zverev and Medvedev all in action