[9] Thomas made his second appearance in the Round 6 clash against A-League runners-up Central Coast, again putting up an impressive performance, pulling off brilliant saves and keeping a clean sheet in the Victory's nil-all draw.

Despite putting up an impressive performance, and making several brilliant saves, the Victory went down 2–1 to the Heart, with goals coming from David Williams and Dylan Macallister.

While Thomas improved, he would struggle to get regular game time, often being the second choice goal keeper behind Covic, Nathan Coe and later Danny Vukovic.

[citation needed] Coe would depart the club at the off-season with most assuming that meant Thomas would be taking the number one goal keeping position.

However, in a slightly surprising move, Melbourne Victory would sign Perth Glory goalkeeper Danny Vukovic meaning that yet again, Thomas would have to settle for the backup 'keeping spot again.

On 5 May 2018, Lawrence was named the best on ground in his team's 1–0 grand final win over Newcastle Jets, and he received the Joe Marston Medal.