Britain's Dan Evans and Neal Skupski missed out on a maiden doubles title together as they lost the Monte Carlo Masters final to Croatian second seeds Nikola Mektic and Mate Pavic.
They lost the Miami Open final to Mektic and Pavic earlier in April.
The victory was the Croatians' fifth ATP Tour title from six finals and they have lost just three matches this year.
"We can't get you yet, but we'll keep trying," said Evans.
On Friday, British number one Evans, 30, saw his singles run in Monte Carlo ended in the semi-finals by Greek world number five Stefanos Tsitsipas.