Montenegro kept up their positive start to the Under 20 European Championship Division B by beating Czech Republic 88-66.
Vladimir Dasic was again the star of the show, contributing 29 points and eight rebounds to the victory, maintaining his position as joint-top average points-scorer in the tournament so far.
Montenegro have now won their first two games as an independent country and are on course to qualify from the preliminary round as they are currently second in Group A behind leaders Germany, who beat Austria 71-63 on Sunday.
Top-scorer Thomas Schreiner was unable to prevent defeat despite netting 24 points for Austria.
In Group B, hosts Poland continued their 100% start to the tournament with an 85-73 win over the Netherlands, Kamil Pietras taking his total for the competition to 53 points with a 24-point haul which helped turn around a 35-44 deficit at the midway point.
In the other game of the group, Ireland picked up their first win, beating Switzerland 74-73.
Top-scorer Scott Kinevane (17) made a last-minute lay-up to snatch victory.
Group C leaders Ukraine continued their high-scoring start to the competition, following up Friday's 107-60 win over Belarus with a 95-54 win over Slovakia.
Oleksandr Kolchenko netted 24 points, including five from six free throws, to leave his side almost assured of qualification.
Portugal moved into second place with a 77-72 win over Belarus, although they face Ukraine in a tough last game.
Finally in Group D, all four teams are now tied on three points, having all won and lost a game each so far.
Great Britain notched up their first victory, beating Belgium 80-68 thanks to 33 points and 15 rebounds from the prolific Daniel Clark.
They remain bottom of the group though on points difference, and to progress will need a final-game win against Romania, who secured an overtime triumph against Finland on Sunday.
The scores were level at 79-79 at the end of the final quarter and though the Finns led for most of the five minutes of overtime, Titus Nicoara snatched two points in the final seconds to win the game.
On Monday, Sweden and Austria take on Germany and Montenegro respectively in Group A, while Estonia and the Netherlands face Poland and Switzerland in Group B, with the final games in all four groups scheduled for Tuesday.
The 18 teams are aiming to finish in the top two of their respective groups, which will see them through to the Qualifying Round, a second group phase which then leads straight to the semi-finals.