Germany scored five first-half goals on the way to a 7-1 demolition of Latvia on Monday, completing a successful dress rehearsal for their European Championship campaign starting next week.
Champions League winner Havertz then played a perfect one-two with Robin Gosens who fired home in his first international in the 19th minute.
Goals from Ilkay Gundogan and Muller quickly made it 3-0, the latter scoring his first goal since his return to the team last month following more than two years out.
The Germans showed none of the conversion problems that had plagued them in recent years and Havertz added another when his shot was deflected into the net by Latvia keeper Roberts Osols.
Serge Gnabry also got on the scoresheet on the stroke of half-time, firing in from a superb Mats Hummels cross before substitute Timo Werner flicked in five minutes after the restart to make it 6-0.
Latvia grabbed a consolation goal through Aleksejs Saveljevs' fierce left-foot strike before Leroy Sane restored the hosts' six-goal advantage with a simple tap-in.
Germany kick off their Euro 2020 group matches against world champions France in Munich on June 15. They also play European champions Portugal and Hungary in Group F.
Line-ups
Germany XI: Neuer, Hummels, Kroos, Muller, Gundogan, Rudiger, Gnabry, Ginter, Kimmich, Gosens, Havertz
Subs: Trapp, Leno, Volland, Emre Can, Hofmann, Sule, Werner, Günter, Sane, Koch, Neuhaus, J. Musiala
Latvia XI: A. Zjuzins, D. Ikaunieks, M. Ošs, K. Kārkliņš, A. Cigaņiks, E. Emsis, R. Ozols, A. Černomordijs, V. Fjodorovs, R. Jurkovskis, R. Uldriķis
Subs: I. Tarasovs, K. Dubra, V. Maksimenko, E. Stuglis, V. Sorokins, R. Matrevics, K. Zviedris, A. Saveljevs, A. Jaunzems, R. Krollis, R. Varslavāns, R. Ķiršs
varunnavani
721
Germany forgot the meaning of 'friendly'
varunnavani
531
Brazil must be very scared right now 😂😂
Kingziz
476
Latvia be like what is the meaning of friendly please 🥺
Jamirl
474
Germany thought Latvia was brazil[Crylaugh][Crylaugh][Crylaugh]
Successful⚡️Alvin
413
"Baby wait. There's a counter attack" "Ahh. Do not end the call. It's Werner."😂😂
varunnavani
378
Germany thought they were playing Brazil 😂😂
Jamirl
353
A rare picture of Havertz,Muller and Gnabry after today's game
Brightberry
284
Summary of Germany against Latvia..😂😂
Brightberry
225
Germany score Sheet against Latvia..😂😂
rohithirapur
15
@varunnavani congratulations your country own today 🇮🇳
yes our captain sunil chetri scored 2 goals, he has more international goals than messi 👏
Agraj_30
10
@varunnavani congratulations your country own today 🇮🇳
Yes.... Sunil Chetri on fire
Proud to be an Indian