The Norwegian, who defeated the retiring Jo-Wilfried Tsonga in his opening match, looked comfortable throughout against Ruusuvuori and raised his level when required, saving all four break points he faced to advance after two hours and 10 minutes.
The 23-year-old arrived in Paris in confident mood after he captured his eighth tour-level title and seventh on clay in Geneva last week. Having made the short journey across from Switzerland, Ruud has quickly adjusted to the colder conditions at Roland Garros and has now won his past six matches.
The eighth seed will aim to advance to the fourth round for the first time in the French capital when he takes on Portugal’s Joao Sousa, who Ruud defeated in the final in Geneva, or 32nd seed Lorenzo Sonego.
In front of a full crowd on Court 14, Ruud dictated the tempo throughout, with his consistent and deep groundstrokes pinning Ruusuvuori behind the baseline. The Norwegian struck 33 winners and committed 24 unforced errors as he pulled his 23-year-old opponent around to improve to 3-0 in their ATP Head2Head series.
Ruusuvuori was competing in the second round in Paris for the first time, having edged Frenchman Ugo Humbert in five sets. He lost in the first round in 2020 and 2021.
Day 5 Preview: Medvedev, Tsitsipas, Rublev Seek Third Round
The Dane, currently third in the Pepperstone ATP Race To Milan, is making his debut in Paris. The 19-year-old has enjoyed a strong season, clinching his maiden ATP Tour title in Munich before he reached the semi-finals in Lyon last week.
Rune, who won 86 per cent (42/49) of his first-serve points against Laaksonen, now holds a 12-3 record on the season on the European clay. He will play Frenchman Hugo Gaston or Argentine lucky loser Pedro Cachin in the third round.