Team-by-team preview capsules for the NBA’s Western Conference: ___ DALLAS MAVERICKS LAST SEASON: 33-49, finished tied for 12th in Western Conference. COACH: Rick Carlisle (12th season with Mavericks, 470-416; 18th season overall, 751-627). PROJECTED STARTING FIVE: G Luka Doncic (21.2 ppg), G Delon Wright (12.2 with Memphis), G-F Justin Jackson (8.2), F Kristaps Porzingis (sidelined by knee injury), C Dwight Powell (10.6). KEY LOSSES: F Dirk Nowitzki, G Devin Harris, C Salah Mejri. KEY ADDITIONS: Wright, G Seth Curry, F Isaiah Roby. PLAYERS TO WATCH: The world will be watching the Euro pair of Doncic and Porzingis, literally. The Mavericks are headliners internationally now that the 20-year-old rookie of the year from Slovenia and the 7-foot-3 Latvian are finally getting to play together. Dallas held Porzingis out for the last two months last season after the blockbuster trade that brought him from New York, even though he could have played. Their debut together is even more intriguing since it’s Dallas’ first season without Nowitzki, the German superstar who retired after setting an NBA record by playing all 21 seasons with the same franchise. The biggest question is who among the role players will emerge. Keep an eye on Wright. The…